Radio Acronyms 4000+ (Always under construction) By Hugh Stegman NV6H At end of file: Police/CB 10-codes Other police codes Computer networking standards [~] = not an acronym, just looks like one Radiospeak, techspeak, milspeak, NASAspeak, and compuspeak all developed for spoken, sent, or stored brevity. As Larry Van Horn is always noting, acronyms and abbreviations don't always save all that much space in written text. Utility World tries to slog through all the alphabet soup and write in good old English. Sometimes we fail. Decode our lapses thusly: Acronym Definition // Parallel transmission (simulcast) on -- /// Cloud layer below observing station +FC Tornado on the ground 1 LT first lieutenant 16-DPSK 16-Phase Differential Phase-Shift Keying 16P4A 16 phase, 4 amplitudes 2 LT second lieutenant 220SMA 220 (MHz) Spectrum Management Assn (Amateur) 2600 (1)2600 Hz, audio frequency used for US telephone idle tones 2600 (2)Hack/Phreak magazine, named in honor of above 2600 (3)Use of tone-spoofing equipment to control phone switches; now a good way to get caught phreaking and go to jail 2G ALE Second generation automatic link establishment 32BDA 32-Bit Disk Access (Windoze) 3D Three dimensional (like some weather models) 3F Three-figure code groups (mixed or all numbers) 3FG Three-figure code groups 3G ALE Third generation automatic link establishment 3G Third Generation 3GPP Third Generation Partnership Project 3G-TM Third Generation Traffic Management Protocol 3L Three-letter code groups 3LG Three-letter code groups 4F Four figure code groups (mixed or all numbers) 4FG Four figure code groups 4L Four-letter code groups 4LG Four-letter code groups 5 by 5 (1) Signal report: readability 5, strength 5 5 by 5 (2) Signal report: you are loud and clear 5D Demand Driven Direct Digital Dissemination 5F Five-figure code groups (mixed or all numbers) 5FG Five-figure code groups 5L Five-letter code groups 5LG Five-letter code groups 73 Old telegraphy slang: "Best regards" 81-81 Strange Russian teleprinting system, popular in Cuba 88 Old telegraphy slang: "Love and kisses" 89/336/EEC European electromagnetic compatibility directive 8-DPSK 8-Phase Differential Phase-Shift Keying 8P2A 8 phase, 2 amplitudes A Index 24-hour magnetic activity index, lower=better A (1)Altimeter setting A (2)Old "A" battery, for portable radio tube filaments A&P Airframe & Powerplant, U.S. aircraft mechanic certificate a/c Aircraft A/D Analog to digital converter A/G Air to ground A0 AM carrier with no modulation, now N0N A1 (Alpha-1) Aircraft maintenance status: no writeups; plane OK A1A Morse telegraphy for aural copy, i.e. "CW" A2 (Alpha-2) Status: write up non-mission-critical system A2A Modulated CW telegraphy for aural copy, i.e. "MCW" A3 (Alpha-3) Status: write up critical system; mission aborted A3E AM voice or broadcasting AA CW prosign: "[repeat] all after" AAA Anti-Aircraft Artillery AAAS American Association for the Advancement of Science AAB Automatic Answer-Back (RTTY) AABCP Advanced airborne command post AACC Airborne Air Command Center AADC Area Air Defense Commander AAF (1)Auxiliary Airfield AAF (2)Army Air Forces, obsolete AAFES Army and Air Force Exchange Service AAIC Accounting Authority Identification Code AAL ATM Adaptation Layer AAL-1 Synchronous adaptation layer designed for carrying voice trunk lines AAL-2 Adaptation layer intended for variable bit rate video, but never really got off the ground and is not offered by vendors AAL-3/4 Adaptation layer intended to be used by Frame Relay and SMDS and other delay-insensitive variable rate or bursty data traffic, but mostly now passed over in favour of AAL-5 AAL-5 'Simple and efficient adaptation layer' for computer networking AALC (1)Amphibious Assault Landing Craft AALC (2)Amplified automatic level control AAM Air to Air Missile AAMDS Automated Air Movement Data System AAMSS Arinc Aeronautical Mobile Satellite Service (proposed; would replace much of MWARA) AAR (1)Air to Air Refueling AAR (2)After-Action Review AAR (3)Automatic Alternate Rerouting AAR (4)Assn. of American Railroads AARS Army Amateur Radio System, started 1925, now part of MARS AASS Advanced Air Surveillance Radar AATO Automated Air Tasking Order AAV Assault Amphibious Vehicle AAVP Advanced Aircrew Vision Protection AAW Anti-Air Warfare AB (1)Air Base AB (2)CW prosign: "[repeat] all before" ABA Australian Broadcasting Authority ABC (1)Atomic, Biological, Chemical (warfare) ABC (2)American Broadcasting Company ABC (3) Australian Broadcasting Corporation ABCA American, British, Canadian, Australian ABCC Airborne battlefield command and control center ABCCC Airborne Command Control Center ABCS Army Battle Command System ABD Air Base Defense ABIS Advanced Battlespace Information System ABITS Airborne Imagery Transmission System ABL Airborne Laser ABM Anti-Ballistic Missile ABN Airborne ABNCP Airborne National Command Post ABO Annular Beam Oscillator ABOR Abort ABU Asia Broadcast Union AC (1)Alternating Current AC (2)Active Components (US Army) AC (3)Acquisition Center AC&I Acquisition, Construction & Improvement ACA (1)Airspace control authority ACA (2)Australian Communications Authority ACAA Automatic chemical agent alarm ACAP Application Configuration Access Protocol (computing) ACAPS Area communications electronics capabilities ACARS Aircraft Communications Addressing and Reporting System ACAT Acquisition Category ACC (1)Air Combat Command (US) ACC (2)Area Communication Center ACC (3)altocumulus castellanus ACCHAN Allied Command Channel ACCINTNET ACC Intelligence Network ACCMSF Advanced Cooperative Collection Management ACCS Air Command and Control System ACE Airborne Command Element ACERT Army Computer Emergency Response Team ACF Autocorrelation Factor ACFT MSHP aircraft mishap ACI Air Control Intercept ACINT Acoustic intelligence ACIS Air Combat Information System ACJ Advisory Circular, Joint ACK Positive Acknowledgment (ASCII 06) ACLS Automatic Carrier Landing System ACM (1)Association for Computing Machinery ACM (2)Advanced Cruise Missile ACM (3)Air Combat Maneuvering ACMI Air Combat Maneuvering Instrumentation ACOM U.S. Atlantic Command ACP (01)Allied Communication Publication (127, etc) ACP (02)Allied Communication Protocol ACP (03)Adjacent Channel Power ACP (04)Adjacent Channel Protection ACP (05)Access Control Point ACP (06)Access Control Protocol ACP (07)Access Communications Processor ACP (08)Achieved Communication Performance (ARINC) ACP (09)Adaptive Communications Processor ACP (10)Advanced Communications Package ACP (11)Alternate Command Post ACP (12)Airborne Command Post ACP (13)Area Command Post ACP (14)Automated Command Post ACP (14)Applied Communication Program ACP (15)Automatic Communications Processor ACP (16)Automatic Colt Pistol ACP (17)Autoloading Colt Pistol ACP100 Allied Call Sign and Address Group System - Instructions and Assignments ACP110 Tactical Call Sign Book ACP112 Task Organization Call Sign Book ACP113 Call Sign Book for Ships ACP117 Allied Routing Indicator Book ACP119 Allied Tactical Voice Call Sign System - Instructions and Assignments ACP121 Communications Instructions - General ACP122 Communication Instructions - Security ACP123 Common Messaging Strategy and Procedures ACP124 Communication Instructions - Radiotelegraph Procedure ACP125 Communication Instructions - Radiotelephone Procedure ACP126 Communication Instructions - Radioteletype Procedure ACP127 Communication Instructions - Tape Relay Procedures ACP127SUP1A Allied RATT Procedures (RTTY) ACP128 ALTERS Operating Procedures ACP129 Communications Instructions - Visual Signalling Procedures ACP130 Direction Finding Procedure ACP131 Communication Instructions - Operating Signals ACP134 Telephone Switchboard Operating Procedure ACP135 Communications Instructions - Distress and Rescue Procedures ACP136 Communication Instructions - Panel Signaling ACP147 Call Sign Book for Merchant Ships in Time of War ACP148 Allied Guide to Master ACP149 Radio Communication Instructions for Merchant Ships Under Naval Control ACP150 Recognition and Identification Instructions, Air, Land, and Sea Forces ACP160 IFF SIF Operational Procedures ACP165 Operational Brevity Codes ACP167 Glossary of Communications-Electronics Terms ACP168 Pyrotechnic Signals ACP176 Allied Naval and Maritime Air Communication Instructions ACP177 Land Forces Electronic Warfare Instructions ACP178 Maritime Electronic Warfare Instructions ACP179 Electronic Warfare Instructions for Air Forces ACP190 Guide to Frequency Planning ACP198 Instructions for the Preparation of Allied Communications Publications ACR Armored cavalry regiment ACRM Automated Communication Resource Manager ACRONYM Actual Computer Related Overused Name You Mention ACS (1)Assistant chief of staff ACS (2)Agile Combat Support ACS (3)Airborne COMINT System ACS (4)Attitude Control System ACSB Amplitude Compandored SideBand ACSL altocumulus standing lenticular cloud ACT Airborne Communications Terminal ACTD Advanced Concept Technology Demonstration ACTEX Active Controls Technology Experiments ACTIVE Advanced Controls Technology for Integrated Vehicles ACTS (1)Air Combat Training System ACTS (2)Automated Computer Time Service ACU Avionics Control Unit ACW Air Control Wing (like 552nd AWACS at Tinker) ADA (1)Americans with Disabilities Act ADA (2)"Official" DoD computer language, not an acronym, named for Ada Babbage, the world's first programmer ADAS AWOS Data Acquisition System (Nice nested acronym) ADC Analog-to-Digital Convertor ADCC Air Defense Control Center addr Address ADDS Aviation Digital Data Service ADES Airdrop equipment and systems ADF (1)Automatic direction finding ADF (2)Australian Defence Forces ADIZ Air Defense Identification Zone ADM Admiral ADMD Administration Management Domain ADO (1)ActiveX Data Objects ADO (2)Active Data Objects ADOC Air defense operation center ADONIS Article Delivery Over Network Information Systems ADP Automated data processing ADPCM Adaptive differential pulse-code modulation ADPE Automated Data Processing Equipment ADPS ASARS Data Processing Station ADPSIS Automated Data Processing Software Inventory System ADPSO Automated Data Processing Security Officer ADPSSO Automated Data Processing System Security Officer ADR CW brevity: address ADRG ARC Raster Digitized Graphics ADS (1)Advanced Distributed Simulation ADS (2)Automatic Dependent Surveillance ADS-B Automated Dependent Surveillance-Broadcast ADSI Air Defense System Integrator ADSL Assymetric Digital Subscriber Line Ae Auroral Electrojet magnetic activity index AEEC Airlines Electronics Engineering Committee AEOS Advanced Electro-Optical System Spectrograph AEPDS Advance Electronic Processing and Dissemination System AES Application Environment Specification AF (1) Air Force AF (2) Audio Frequency (30 Hz - 30 kHz) AFAMPE Air Force Automated Message Processing Exchange AFATDS Advanced Field Artillery Tactical Data System AFB Air Force Base AFC Automatic frequency control AFCA Air Force Communications Agency (US) AFCS Automatic Flight Control System AFDC Air Force Doctrine Center AFEPS ACARS Front-End Processor System (ground computer network) AFETR Air Force Eastern Test Range AFEWES Air Force Electronic Warfare Effectiveness Simulator AFFSA Air Force Flight Standards Agency AFGIHS Air Force Geographic Information Handling System AFGWC Air Force Global Weather Central at Offutt AFB, NE AFI (1)Africa/Indian Ocean (MWARA) AFI (2)Air Force Instruction (official directive) AFI (3)American Film Institute AFIT Air Force Institute of Technology AFIWC AF Information Warfare Center AFK Absolute Frequency Keying (amateur very slow Piccolo) AFMC Air Force Materiel Command AFMSS Air Force Mission Support System AFN American Forces Network (US broadcast for military) AFNET Air Force Integrated Telecommunications Network AFOS Automation of Field Operations and Services AFOSR Air Force Office of Scientific Research AFR Armed Forces Radio AFRES Air Force Reserve (US) AFRL Air Force Research Laboratory AFRN Armed Forces Radio Network AFRTS Armed Forces Radio & Television Services AFS (1)Air Force Station AFS (2)Aeronautical Fixed Service AFSAA AF Studies and Analysis Agency AFSATCOM Armed Forces Satellite Communication AFSFC Air Force Space Forecasting Center AFSFCR AF Space Forecast Center Replacement AFSK Audio frequency-shift keying AFSOC Air Force Special Operations Command AFSOF Air Force Special Operations Forces AFTCO Air Force Telecommunications Certification Office AFTN Aeronautical Fixed Telecommunication Network AFV Alternate Fuel Vehicle AFW Air Force Weather AFWSS Air Force Weather Support System AFWTF Atlantic Fleet Weapons Training Facility AG (1)Adjutant general AG (2)Airlift Group AGC Automatic gain control AGE Aerospace Ground Equipment (pronounced like how old you are; when you replace it you order New Age) AGL (1)Above ground level AGL (2)Air to Ground Laser AGM Air to Ground Missile AGU American Geophysical Union AGWPE AGW Packet Engine (creator: SV2AGW) Ah Ampere-hour(s), battery capacity AH Authentication Header AHAMSL Antenna height above mean sea level AHD Acoustic Hailing Device AHDL Analog Hardware Descriptive Language AHF Adaptive High Frequency AHMSL Antenna height above mean sea level AHP Army Heliport AI (1)Artificial intelligence AI (2)Air Interdiction AI (3)Airborne Interceptor AI (4)Avionics Infrastructure AIA Air Intelligence Agency AIC Air Intercept Control AICPITS All India Coordinated Program of Ionosphere & Thermosphere Studies AIDA Atmospheric Investigations of Dynamics over Arecibo AIDC Automatic Identification and Data Capture AIFSS Automated International Flight Service Station AIG (1)Address Indicator Group AIG (2)Air Intelligence Group AIM (1)Air launched Interceptor Missile AIM (2)AOL Instant Messenger (popular internet talk program) AIN Advanced Intelligent Network (US NCS) AIR (1)All-India Radio AIR (2)Aviation Incident Response (Red Cross) AIREP Air Report; weather observation, like a PIREP AIRES Advanced Imagery Requirements and Exploitation System AIRK Area interswitch rekey AIRMET Air Meteorological Information AIRST Advanced Infrared Search and Track AIS (1)Automatic Identification System (USCG) AIS (2)(Universal) Automated Identification System AIS (3)Alarm Indication Signal AJ Anti-Jam AJCOM Anti-Jam Communications AkDT Alaskan Daylight Time, US AkST Alaskan Standard Time, US AL Approach and landing ALARM Air-Launched Anti-Radiation Missile ALC (1)Automatic level control ALC (2)Air logistics center ALC Air Logistics Center ALCC (1)Airborne Launch Control Center ALCC (2)Airlift Coordination Cell ALCE Airlift Control Element ALCF Airlift Control Flight ALCM Air Launched Cruise Missile ALCS (1)Airlift Control Squadron ALCS (2)Airborne Launch Control System ALE Automated Link Establishment ALERT Attack & Launch Early Reporting to Theater ALF Absorption Limiting Frequency, realtime version of LUF AlGaN Aluminum-Gallium Nitride ALOC Air lines of communication Aloha Wide-area net protocol, developed at U of Hawaii ALP airport location point Alpha + # Aircraft maintenance status (1 is best) Alpha Hotel A-- H--- (also Adam Henry) ALQA Active Link Quality Analysis ALS Airlift squadron ALTERS Allied Telecommunications Record System ALU Arithmetic Logic Unit (computer h/w) ALW Airlift Wing AM (1)Amplitude Modulation AM (2)Aeronautical Mobile AM (3)Ante Meridian, hours between midnight and 11:59 local AMARC Association Mondiale des Radiodiffusuers Communautaires AMASS Airport Movement Area Safety System AMBALG Algerian Embassy AMC (1)Air Mobility Command (old Air Force MAC, MATS) AMC (2)Army Materiel Command (US) AMCC Air Mobility Control Center AMCLD Active Matrix Liquid Crystal Display AMCO Aircraft maintenance company AMCS Air Mobility Control Squadron AMD (1)American Micro-Devices (with Cyrix, Intel's competition) AMD (2)Automatic Message Display AMDRFM Advanced Monolithic Digital Radio Frequency Memory AME (1)Automatic Message Exchange AME (2)Air Mobility Element AME (3)Amplitude modulation equivalent AMEDD Army Medical Department AMI Alternate Mark Inversion AMMCS Airborne Multimedia Multiservices Communication System AMO Air & Maritime Operations AMOG Air Mobility Operations Group AMOS Air Force Maui Optical Site AMP Antenna Maintenance Program AMPS (1)Advanced Mobile Phone Service AMPS (2)Automated Mission Planning System AMRAAM Advanced Medium-Range Air-to-Air Missile AMRAD Amateur Radio Research And Development Corporation AMRS Austrian Military Radio Society AMS Analog Mixed Signal AMSA Australian Maritime Safety Agency AMSAT Radio Amateur Satellite, Inc. AMSI Arctic Maritime Safety Information AMTOR Amateur Teleprinting Over Radio (Ham SITOR) AMVER Automated Mutual Assistance Vessel Rescue System AMW Air Mobility Wing AMX Air Mobility Express AN Army/Navy (prefix on US military type designators) AN/FRT Army/Navy Fixed Radio Transmitting AN/GRC Army/Navy General Radio Communication AN/MRC Army/Navy Mobile Radio Communication ANARC Assn. of North American Radio Clubs ANDVT Advanced Narrowband Digital Voice Terminal ANG Air National Guard ANGB Air National Guard Base ANI Automatic Number Identification ANL Automatic noise limiter ANMCC Alternate National Military Communications Center (?)-WAR 46 Annmt Announcement Annr Announcer ANS Advanced Network Services, operates an Internet backbone ANSI American National Standards Institution ANT (1)Antenna [~] ANT (2)Advantaged Node technology ANZUK Australia, New Zealand, United Kingdom (alliance) ANZUS Australia, New Zealand, United States (alliance) AO Area of operations AO1 automated station without precipitation discriminator AO2 automated station with precipitation discriminator AOA (1)Angle Of Arrival AOA ACARS Over AVLC (ARINC, neat nested acronym) AOC (1)Air Operations Center AOC (2)Army Operations Center (Pentagon) AOC (3)Air Operational Control AOE Airport of Entry AOI Area Of Interest AOO Area of operations AOR (1)Area of responsibility AOR (2)Atlantic Ocean Region (USCG GMDSS) AOV ACARS Over VDL (ARINC, neat nested acronym) AOS (1)Acquisition Of Signal AOS (2)Area Of Service Ap Planetary A index of geomagnetic activity AP Associated Press APC Armored personnel carrier APCO 25 New standard for digital public safety radio APCO Association of Public Safety Communications Officials API Application Programming Interface (computers) APIC APCO Project 25 Interface Committee APIPA Automatic Private Internet Protocol Addressing APL A Programming Language (computer code) APLink Amtor-Packet Link APNIC Asia Pacific Network Information Centre APO (1)Air Post Office APO (2)Army Post Office APOD Aerial port of debarkation APOE Aerial port of embarkation APPCON Approach Control APRNT apparent APRS (1)Automatic Position Reporting System, ham tracking w/GPS APRS (2)Automatic Packet Reporting System APRX approximately APSC APCO Project 25 Steering Committee APT Automatic Picture Transmissions APU Auxiliary Power Unit AQC Automatic Quick Call AR (1) Aerial refueling AR (2) Ground track for above AR (3) CW prosign: "End of message" AR (4) Army Regulation ARA Appletalk Remote Access, Mac networking ARB Air Reserve Base ARC (1)American Red Cross ARC (2)Airborne Radio Communications (AN/ARC-xxx) ARC (3)Air Reserve Component ARC-190 Common Collins mil HF aircraft radio, civil version is HF-190 ARC-220 Fancy Collins HF radios for new US mil aircraft ARC-230 Collins 400-watt HF Link-11/Tadil-A aircraft radio, civil voice version is HF-121 ARCAL Aircraft Radio Control of Aerodrome Lighting Archie Internet database search program, finds files ARCP Air Refueling Control Point ARD Automatic Ring Down ARDF (1)Automatic Radio Direction Finding ARDF (2)Amateur Radio Direction Finding AREC (1)Air resource element coordinator AREC (2)Amateur Radio Emergency Corps, now ARES ARES Amateur Radio Emergency Service ARF Air Reserve forces ARFA Allied Radio Frequency Agency ARFOR Army forces ARG (1)Amphibious Ready Group ARG (2)Air Refueling Group ARGOS Advanced Research and Global Observation Satellite ARIA Advanced Range Instrumentation Aircraft ARIB Association of Radio Industry Businesses (Japan) ARIDPCM Adaptive Recursive Interpolated Differential Pulse Code Modulation (whew!) ARIN American Registry for Internet Numbers ARINC Aeronautical Radio, Inc (US radio consortium) ARIP Air Refueling Initial Point ARISS Amateur Radio on the International Space Station ARM Anti-Radiation Missile ARMRV (1)Armored Mobile Reconnaissance Vehicle ARMRV (2)Armored Multi-Role Vehicle ARNG Army National Guard ARO Army Research Office ARP Address Resolution Protocol, Internet ARPA Advanced Research Projects Agency, operated original Internet ARPANET ARPA Network, became NSFNET, now separate from Internet ARQ Synchronous transmission and automatic repetition teleprinter system ("Acknowledge Request") ARQ6-90 Six-character blocks simplex ARQ teleprinter system ARQ-E3 Single channel ARQ teleprinter system ARRL American Radio Relay League ARRS Aerospace Rescue and Recovery Service ARS Amateur Radio Service ARSA (1)Airborne Reconnaissance and Surveillance Architecture ARSA (2)Airport Radar Service Area ARSOF Army special operations forces ARTCC Air Route Traffic Control Center ARTE (1)French media company ARTE (2)ADA Run Time Environment ARTG Amateur Radio Teleprinter Group (Swiss) ARTS Automated Remote Tracking Station ARW Air Refueling Wing (USAF/AFRES) ARWO Aerial Reconnaissance Weather AS (1) Air station AS (2) CW prosign: "Please Wait" AS (3) Analog secure (like original PARKHILL) AS (4)Submarine Tender (USN) ASA American Standards Association, obsolete ASAM Anti-Shipping Activity Message (warning) ASAP As Soon As [humanly] Possible; how one handles FLASH traffic ASAR Advanced Synthetic Aperture System ASARS Advanced Synthetic Aperture Radar System ASAS All Source Analysis System (US Army) ASAS-RWS ASAS Reconfigurable Work Station ASAT Antisatellite ASB Aviation support battalion ASC (1)AUTODIN Switching Center ASC (2)Accredited Standards Committee (ANSI) ASC (3)American Society of Cameramen (motion picture) ASC2A Air & Space Command & Control Agency ASCC Army service component command ASCIET All Services Combined Identification Evaluation Team ASCII American Standard Code for Information Interchange, 7-bit computer alphabet, usually extended to use 8th bit ASCOT Air Support Command Operations Task (RAF Air Transport) ASD Assistant Secretary of Defense ASDE-3 Airport Surface Detection Radar System ASDS Advanced SEAL Delivery System (a minisub; see SEAL) ASEAN Association of South East Asian Nations (old SEATO) ASECNA Agence pour la Securite de la Navigation Aerienne en Afrique et a Madagascar ASF Advanced Systems Format (Microsoft media player) ASG (1)Aeronautical Standards Groups ASG (2)Area support group ASIC Application Specific Integrated Circuit ASID Advanced Secure Information Dissemination ASIM Automated Security Incident Measurement ASIO Australian Security Intelligence Organisation ASIT Adaptable Surface Interface Terminal ASK Amplitude Shift Keying ASL Above Sea Level ASLAR Aircraft Surge Launch and Recovery ASM (1)Air to Surface Missile ASM (2)Analog Switching Module ASM (3)Assembler (computer code) ASMB Area support medical battalion ASMC Area support medical company ASME American Society for Mechanical Engineers ASMRO Armed Services Medical Regulating Office ASO Air surveillance officer ASOC Air Support Operations Center ASOS Automated Surface Observation System ASOTSE Army special operations theater support element ASP (1)Ammunition supply point ASP (2)Acquisition Support Plan ASP (3)Active Server Pages ASP (4)Application Service Provider ASR (1)Automatic Send-Receive ASR (2)Airport Suveillance Radar Assn Association Assoc Association AST Atlantic Standard Time, Canada ASTM American Society for Testing and Materials ASU Aircraft Starting Unit ASW Anti-submarine warfare AT (1)Advanced Technology (IBM's original name for its improved PC, now a standard architecture) AT (2)Amateur (radio allocation code) ATA (1)Army Technical Architecture ATA (2)AT Attachment ATA (3)American Trans Air ATAPI AT Attachment Packet Interface ATC Air Traffic Control ATCALS (1)Air Traffic Control and Landing System ATCALS (2)Air Traffic Control Liaison Section ATCCS Army Tactical Command & Control System ATCS Advanced Train Control System ATCT airport traffic control tower ATD Advanced Technology Demonstration ATDL 1 Army Tactical Data Link 1 ATF Advanced Tactical Fighter ATF Bureau of Alcohol, Tobacco & Firearms ATH Air Transportable Hospital ATG Afloat Training Group (USN) ATHS Automatic Target Hand-off System ATIS Automated Terminal Information System (usually voice loop) ATM (1)Asynchronous Transfer Mode, 53-byte packets ATM (2)Automated Teller Machine ATM (3)Advanced trauma management ATMs Air Tasking Messages ATN Adventist Television Network ATO Air Tasking Order ATOI Aerial Track Of Interest A-TOR Automated Telex Over Radio ATP (1)Ammunition transfer point ATP (2)Appletalk Transaction Protocol, Mac networking ATP (3)Acquisition, Tracking & Pointing ATP (4)Authority to Proceed ATP (5)Air Traffic Procedures ATR Air Transport Rack (standard airplane radio bay) ATR/ATC Automatic Target Recognition/ Automatic Target Correlation ATS (1)Aeronautical Telecommunications Services ATS (2)Applications Technology Satellite ATSA Aviation and Transportation Security Act ATU (1)Antenna Tuning Unit ATU (2)Arab Telecommunications Union ATU-A Arabic ATU-80 alphabet ATV (1)Amateur (fast-scan) television ATV (2)All-Terrain Vehicle AUI Attachment Unit Interface, Ethernet AUSREP Australian Ship Reporting System AUTO Weather observation is from automated station [~] AUTOCONET Automatic Digital Network Conference Network AUTODIN Automatic Digital Network (US military) AUTOVON Automatic voice network (now DSN as of 1990) AUV Autonomous Underwater Vehicle AUW All Up Weight (gross) AV Air Vehicle AVC Automatic volume control AVHRR Advanced Very High Resolution Radiometer AVI Audio Video Interleave (Microsoft file format) AVIM Aviation intermediate maintenance AVL Automatic Vehicle Locating AVLC (1)Aviation VHF Link Control AVLC (2)Automatic Vehicle Location and Control AVN AViatioN weather model AVO Air Vehicle Operator AVTR Airborne Video Tape Recorder AVUM Aviation unit maintenance AWACS Airborne Warning And Control System AWADS Adverse Weather Aerial Delivery System AWAPS Automated Weather Distribution System AWDS Adverse Weather and Debriefing System AWG American Wire Gauge AWGN Arbitrary White Gaussian Noise AWIPS Advanced Weather Interactive Processing System awk Aho, Weinstein & Kernighan, wrote a Unix script language AWN Aviation Weather Network, now on US Air Force Digital Weather Switch AWO American Waterway Operators AWOL Absent without leave AWOS Automated Weather Observing System AWR Adventist World Radio AWS (1)Air Weather Service AWS (2)Advisory Warning System AWS (3)Automated Weather Systems AWS (4)Automated Weather Station AWST Automated Weather Station AX.25 Amateur variant of CCITT X.25 packet radio protocol B (1)began B (2)old "B" battery for tube plates, typically 90 volts B&G Bombing & Gunnery B/m Benchmark B/U Backup B+ Tube plate voltage (highest in set) B8E Mode: Independent sideband, different voice programs B9W Mode: Independent sideband, mixed voice & data modes BA Braking action BAA (1)Broad Agency Announcement BAA (2)Broad Area Announcement BAC Broad Area Coverage BAe British Aerospace Bae British Aerospace BAI Backup Aircraft Inventory BAI Battle Area Interdiction Balun Balanced-to-unbalanced line transformer [~] BAM Beta and Advection Model (wx) BAN Base Area Networks BANANA Build Absolutely Nothing Anywhere Near Anyone (municipal response to most radio proposals) BAQ Basic allowance for quarters BAS Basic allowance for subsistence BASIC Beginners' All-Purpose Symbolic Instruction Code, computer language BAT (1)Blood Alcohol Testing (the "Batmobile," in the field) BAT (2)File extension: execute as command list (Batch job) BAT (3)Brilliant Anti-armor Submunition Baud Computer transmission unit, one state transition per second, no longer one bit per second in complex modulation schemes BBC British Broadcasting Corporation BBCS Broadband Connectivity Service (Swisscom) BBIS Battle Broadcast Information System BBN Backbone network BBS (1)Bulletin Board System (computer networking) BBS (2)Battery backup system BC (1)Broadcast BC (2)Back course BC (3)Patches (of sig. Weather) BC2A Bosnia Command & Control Augmentation BC3 Battle management and command, control and communications BCA Broadcast Control Authority BCB Broadcast Band (typically 540-1710 kHz) BCC (1)Base Communication Center BCC (2)Bureau Communication Center (LAPD) BCC (3)Battlefield circulation control BCC (4)Blind Carbon Copy (e-mail) BCD (1)Binary-coded decimal BCD (2)Bad conduct discharge BCE Base civil engineer BCF Backup communications facility, Dahlgren, VA BCFG Fog patches BCI (1)Broadcast interference (from xmtr to bc) BCI (2)Binary-coded information BCL (1)Broadcast listener BCL (2)Broadcast Communications Limited (New Zealand) BCM Baseline correlation matrix BCO (1)Base communications officer BCO (2)Base contracting officer BCO (3)Broad concept of operations BCP (1)Base communications package BCP (2)Base comprehensive plan BCS Broadcast Keying Station BCT Battlefield Communications Terminal bd Baud BDA (1)Battle damage assessment BDA (2)Bermuda (NASA) BDAR Battle damage assessment and repair bde Brigade BDU (1)HFDL: Basic Data Unit BDU (2)Battle dress uniform BEAR Beam Experiment Aboard Rocket BEC Bulk encrypted communications BEEF Base Engineering Emergency Force,("Prime BEEF team") BEL Bell (ASCII, RTTY) Bel Unit of voltage or power ratio, named for Alexander Graham Bell, usually expressed in deciBels BEP (1)Bit error probability BEP (2)break-even point BER Bit Error Rate BERT (1)Bit error rate test(er) BERT (2)Bit Error Rate Testing BF Basic Function BFACS Battlefield Functional Area Control Systems BFBS British Forces Broadcasting Service BFO (1)Beat frequency oscillator (CW/SSB mode of receiver) BFO (2)Backhaul follow-on BFSK Binary Frequency-Shift Keying BG Brigadier general BGEN Brigadier general BGP Border Gateway Protocol (TCP/IP) BICE Bureau of Immigration and Customs Enforcement BID Billing Identifier BIDDS Base integrated digital distribution system BIDS Backup information display system BIFC (1)Boise Interagency Fire Cache, obsolete BIFC (2)Boise Interagency Fire Center, now NIFC BiFET Bipolar Field Effect Transistor BIH Bureau International l'Heur, International Time Bureau, coordinates UTC leap seconds BILS Ballistic Impact Locator System Bin Binary BIND (1)Berkeley Internet Name Domain BIND (2)Berkeley Internet Name Daemon (old) BIND (3)Buggy Internet Name Daemon (geekspeak) Binhex Binary to hexadecimal, usually for sending binaries as ASCII BIOS Basic Input/Output System (part of computer op-system) BIOT British Indian Ocean Territory BIP Base Information Protect BIPS (1)Billion Instructions per Second (computing) BIPS (2)Backup Impact Prediction System BIPS Billion Instructions Per Second B-ISDN Broadband-Integrated Services Digital Network BIST Built-In-Self-Test Bit (1)BInary digiT, a one or zero, basic digital information unit BIT (2)Built-In Test BIT Built in Test Bit/s Bit per second BITE Built-In Test Equipment BITNET Because It's Time NETwork, from IBM, now global BIU Bus interface unit (computer h/w) BK CW prosign: long break or break-in BKN Broken cloud cover BL (1)Baseline BL (2)blowing BLAISE (1)British Library Automated Information Service BLAISE (2)Blaise Pascal, French Mathematician BLDU Blowing dust BLER Block Error Rate BLERT Block Error Rate Testing BLEVE Boiling Liquid Expanding Vapor Explosion BLM Bureau of Land Management (US) BLOS Beyond line of sight BLPY Spray BLS Bureau of Labor Statistics (US) BLSA Blowing sand BLSN Blowing snow BM Battle Management BMC2 Battle Management, Command and Control BMC3 Battle Management, Command, Control and Communication BMC3I Battle Management C3I BMC4ISR Battle Management C4I Surveillance and Reconnaissance BMD Ballistic Missile Defense BMDATC Ballistic missile defense advanced technology center BMDC Ballistic Missile Defense Center BMDCCC Ballistic missile defense command and control center BMDE Ballistic missile defense enhancement BMDO Ballistic missile defense organization, formerly SDIO BMDOC Ballistic missile defense operating center BMDSCOM Ballistic Missile Defense Systems Command, now U.S. Army Strategic Defense Command BMEWS Ballistic Missile Early Warning System BMO Ballistic Missile Office (US) BMOPS Battle Management Operations BMP (1)File extension: bitmap image BMP (2)Battle manager processor BMS Backward Music Station (weird RF feedback on HF) BMT (1)Ballistic Missile Threat BMT (2)Beam Management Terminal BMT (3)Bronx Motor Transit BMT (4)Ballistic Missile Technology BMT/SS Ballistic Missile transporter, storage and shipping bn Battalion BN CW prosign: repeat between -- and -- BNC (1)Bayonet Neill-Concelman (cable connector) BNC (2)Bayonet Navy Connector (alternate) BNC (3)Blimped Noiseless Camera (Classic Mitchell) BNCC Base Network Control Center BNCR Blimped Noiseless Camera, Reflex BnOC Battalion Operations Center BNSC British National Space Center BO Bad Order (inoperative unit writeup) BoD Board of Directors BOM Bureau Of Meteorology (Australia) BOND Beginning Of Next Day BOOTP Bootstrap Protocol BOOTP Bootstrap Protocol (IP addressing) BOPS Billion operations per second (computing) BOQ Bachelor Officer Quarters BORAM Block-Oriented RAM BOSS Battlefield Optical Surveillance System BOT Beginning of Tape bot Robot, typically a network program that does an admin duty BP Bandpass BPI Boost-Phase Intercept BPL Broadband over Power Line bpp bits per pixel bps Bit per second, not necessarily a "baud" Bps Bytes per second BPSK Biphase Shift Keying BQ (1)Beam Quality BQ (2)Acknowledging receipt (DSC protocol) BR Bridgewire resistance BR mist BRAC Base Realignment And Closure BRACC Base Realignment And Closure Commission (US military) BRB Be Right Back (Internet) BRD Broadcast brdg bridge BRI Basic Rate Interface BRI Basic Rate ISDN, 2 64Kbps channels BRV (1)Booster Recovery Vessel (NASA) BRV (2)Ballistic reentry vehicle (Stratcom) BS (1)Battle staff BS (2)Battle station BS (3)Backspace BS (4)aka "Bravo Sierra;" the excrement of bulls BSA (1)Brigade support area BSA (2)Birmingham Small Arms BSC Base security council BSD Berkeley Software Distribution (Unix type) BSE Broadcast Satellite Experiment BSS (1)Broadcast Satellite System BSS (2)Broadcasting Satellite Service BSSC Battle staff support center BSTRS Base Support Trunked Radio System, aka "B-STARS" BSU (1)Baseband separation unit BSU (2)Bulk Storage Unit BSVS Backup Secure Voice System BT (1)("Bravo Tango") Bomb threat BT (2)CW prosign: short break BT (3)British Telecom BTC Block transfer controller (computing) BTH Below (beyond) the horizon BTI British Telecom International BTL Black telemetry (USAF) Btry Battery BTS Broadcast Transmitting Stations BTW By the way Buff Big Ugly Flying F[ellow] (B-52) BUFR Binary Universal Format for Representation BULLDOG BULLSEYE US Navy HF upgrade, like USAF's SCOPE, but includes DF [~] BUMCS Backup Master Control Station (GPS, Gaithersburg, MD) BUR Bottom Up Review BURN 1000W UHF aircraft orderwire (US mil; not an acronym, refers to high power) BVR Beyond Visual Range BVR Beyond visual range BW (1)Bandwidth BW (2)Biological Weapon BWC Bandwidth Compression BWS Base weather station BX Base exchange BZ ("Bravo Zulu") Good job C (1)Capacitance, in farads C (2)Confidential C (3)the C programming language C (4)Celsius C (5)Designator for head of British MI6 C (6)Center (with reference to runway designation) c The speed of light, and radio waves, in a vacuum C&DH Communications & Data Handling C&DP Communications & Data Processing c/s Callsign c/w Callword C2 Command and Control C2CM Command and Control Countermeasures C2IPS Air Mobility Command and Control Information Processing System C2P Command and Control Processor C2V Command and Control Vehicle C2W Command and Control Warfare C2WC Command and Control Warfare Commander (US Navy) C3 Command, Control and Communications C3F Mode designation: television or video C3I Command, Control, Communications and Intelligence C3S Command, control and communications segment C3SMP Command, control and communications system master plan C4I Command, Control, Communications, Computers and Intelligence C4ID Command, Control, Communications, Computers and intelligence Dissemination C4IFTW C4I for the Warrior C4ISR Command, Control, Communications, Computing, Intelligence, Surveillance, & Reconaissance C4S Command, Control, Communications, Computer Systems C4SMP Command, control, communications and computers system master plan CA (1)civil affairs CA (2)COMSEC Account CA (3)cloud-air lightning CA (4)Counter Air CA (5)Cyanoacrylate (Super Glue) CAATS Canadian Automated Air Traffic System CAB Combat Area Broadcast CACS Command And Control Squadron CAD (1)Computer-aided design CAD (2)Coherent amplitude detector CAD (3)Computer-aided dispatch CAD/CAM Computer aided design/computer aided manufacturing CADRG Compressed Arc Digitized Raster Graphics CAE (1)Common Application Environment CAE (2)Computer Aided Engineering CAEWIS Computer Aided Electronic Warfare Information System CAF Combat Air Forces CAFWSP CAF Weather Support Package CAI (1)Computer-aided instruction CAI (2)Cooperative Airborne Identification CAINS Carrier Aircraft Inertial Navigation System CAL Calibrate, calibration CALLS Contact And Long-range Liaison System (USCG) CALM Codan Automated Link Management CALS (1)Computer-aided Acquisition & Logistics System CALS (2)Contingency Airfield Lighting System CAM Computer-aided manufacturing camo Camouflage CAMO Computer-aided manual operation CAMSLANT Communications Area Master Station, Atlantic CAMSPAC Communications Area Master Station, Pacific CAN (1)Cancel (ASCII) CAN (2)Controller Area Network (industrial automation) CANFORCE Canadian Forces CANR Canadian NORAD Region CANUS Canada/US CAOC (1)Combined Air Operations Center CAOC (2)Combined Allied Operations Center, Vicenza, IT (Allied Force) CAP (1) Civil Air Patrol CAP (2) Carrierless Amplitude Phase CAPCOM Capsule Communicator (NASA) CAPEG Cape Canaveral Ground Antenna (GPS) CAPPS Computer Assisted Passenger Prescreening System CAPS Center for the Analysis and Prediction of Storms (NWS) CAPT Captain CAR Caribbean (MWARA) CARB Channel Availability Radio Bulletin (NATO) CARCAH Chief, Aerial Reconnaissance Coordination, All Hurricanes (NHC) CARIBROC Caribbean Regional Operations Center CARR Corrective Action Request & Report CAS (1)Close Air Support CAS (2)Collision Avoidance System CAS (3)Calibrated Air Speed CASE (1)Common automated system execution CASE (2)Computer-aided software engineering CASE (3)Computer-aided system engineering CASREP Casualty Report CAT (1)Clear Air Turbulence CAT (2)Computer Aided Transceiver, proprietary control interface CATIS Computer Aided Tactical Information System CATT Computer Assisted Technology Transfer CATV Community Antenna Television ("cable") CAU Crypto Ancillary Unit CAV (1)Collision Avoidance CAV (2)Conditionally Available (LA City FD) CAV (3)Ceiling and visibility CAVOK Ceiling & Visibility OK (non-US METAR) CAVU Ceiling & visibility unlimited CB (1)Citizen Band Radio (legal or otherwise, around 27 MHz) CB (2)Cumulonimbus (thundercloud) CBAA Community Broadcasting Association of Australia C-band 4-8 GHz microwave band CBC Canadian Broadcasting Company CBFS Cesium Beam Frequency Standard CBM Central battle management CBMAM Cumulonimbus mammatus cloud CBP Customs and Border Protection CBR (1)Chemical, Biological, Radiological (warfare) CBR (2)Constant bit rate CBRN Caribbean Basin Radar Network CBS Columbia Broadcasting System (U.S.) CBT (1)Computer-based training CBT (2)Combat CBTS Computer-based training system CBU Cluster Bomb Unit CBW (1)Chemical & Biological (warfare) CBW (2)Constant bandwidth CC (1)Transmission is in Standard Chinese ("Mandarin") CC (2)Command & Control CC (3)Command Center CC (4)Control Center CC (5)Commander CC (6)Computer controller CC (7)Copies CC (8)C Compiler (unix) CC (9)cloud-cloud lightning CC&D Camouflage, concealment and deception CC&R Covenants, Conditions & Restrictions; what you check before buying a home if you intend to build an antenna there CCAS Cape Canaveral Air Station, FL, formerly CCAFS CCB (1)Configuration Control Board CCB (2)Computer Controlled Brake (railroad) CCC (1)Central computer complex CCC (2)Communications control complex CCC (3)Consolidated Command Center (NORAD) CCD Charge Coupled Device CCDM Consultative Committee for the Definition of the Meter CCDS Consultative Committee for the Definition of the Second CCE (1)Command & control element CCE (2)Consultative Committee on Electricity CCEMRI Consultative Committee for Ionizing Radiations CCG Calibration Coordination Group CCIP Continuously-Computed Impact Point CCIR International Radio Consultative Committee, now ITU-R CCIR 476-4 International SITOR character set CCIRID Charge-coupled infrared imaging device CCITT Comite Consultatif International de Telegraphique et Telephonique (International Telegraph & Telephone Consultative Committee), obsolescent CCL Common Command Language CCM (1)Combined Cipher Machine (WWII Allies) CCM (2)Counter-Countermeasures CCMC Canadian Centre for Maritime Communications CCP Console Command Processor, part of CP/M CCPC Civil Communications Planning Committee (NATO) CCPDS-R Command Center Processing and Display System - Replacement CCR Central Control Room CCRP Continuously-Computed Release Point CCS (1)Continuous Commercial Service (power rating) CCS (2)Charge Control System CCSL cirrocumulus standing lenticular cloud CCT Computer Compatible Tape ccTLD Country Code Top Level Domain CCTV Closed Circuit Television C-cubed Command Control and Communications CCV Code change verifier CCW (1)Counter-clockwise CCW (2)Command & Control Warfare CCW (3)Continuous Carrier Wave CCW (4)Coherent CW CCW (5)Class C CW biasing (most efficient) CD (1)Compact Disc CD (2)Civil Defense (in U.S., now FEMA) CD (3)Carrier detect (modem line) CDA (1)Central distribution amplifier CDA (2)Command & data acquisition CDB Command data buffer CDC (1)Canadian Department of Communications CDC (2)Centers for Disease Control (US) CDC (3)Control Data Corporation CD-DA Compact Disc Digital Audio (format, part of the "Red Book") CDE Common Desktop Environment CDF (1)Common Data Format CDF (2)California Division of Forestry (fire fighters) CDHF Central Data Handling Facility CD-I Compact Disc - Interactive (one format in the "Green Book") CDIS Canadian Defence Intelligence Staff CDL Common Data Link CDM Chemical Downwind Message (US Army) CDMA Code Division Multiple Access CDMA One (IS-95) Qualcomm 2nd generation CDMA CDMA2000 3G CDMA technology CDNU Control Display Navigation Unit CDR (1)Commander CDR (2)Command destruct receiver (Stratcom) CD-R Compact Disc - Recordable CDRAM Cache Dynamic Random Access Memory CD-ROM XA CD-ROM eXtended Architecture, extends the "Yellow Book" CD-ROM Compact Disc Read Only Memory CD-RTOS Compact Disc - Real Time Operating System (CD-I) CDS (1)Canadian Defence Staff CDS (2)Combat Direction System CDT Central (US) Daylight Time CDU Control display unit (fancy "control head") CE (1)Conformite Europeanne (European Conformity); mark put on products for EEC CE (2)Committee that sets these requirements CEC (1)Commission of the European Communities (drafts "CE" standards) CEC (2)Cooperative Engagement Capability CECOM US Army Communications Electronics Command CENTCOM U.S. Central Command CEOI Communications-Electronics Operation Instructions CEP (1)Central East Pacific (MWARA) CEP (2)Circular Error Probability CEP (3)Circular Error Probable CEPPO Chemical Emergency Preparedness and Prevention Office CEPT Conference of Postal & Telecommunications Administrations (EU) CEPTAG Civil Emergency Planning Telecommunications Advisory Group (Joint US/Canadian) CERDEC Communications Electronics Research, Development and Engineering Center CERN Centre Europ'eene por la Recherche Nucleaire, Center for European Nuclear Research, huge particle accelerator center, WWW originated there CERT Computer Emergency Response Team (Internet security) CF (1)Canadian forces CF (2)Center frequency CFAP Commandement Force Aerienne de Projection (French AF) CFARS Canadian Forces Affiliate Radio System CFB Canadian Forces Base CFBL Call Forwarding Busing Line (telco) CFBS Canadian Forces Broadcasting Service CFDA Call Forwarding Don't Answer (telco) CFEP Communications front end processor CFL Confidential Frequency List (good shortwave publication) CFM Cubic feet per minute CFR 33: USCG Navigation Regulations CFR 46: USCG Vessel Regulations CFR 47: FCC Regulations CFR Code of Federal Regulations CFS (1)Center for Standards CFS (2)Canadian Forces Station CFT Center Frequency Tone CG (1)Coast Guard CG (2)Commanding General CG cloud-ground lightning CGAS Coast Guard Air Station CG-C2 Coast Guard Command & Control CGCWOA (US) Coast Guard CW Operators Assn. (see CW) CGDN Coast Guard Data Net CGM (1)Computer Graphics Metafile CGM (2)Corrected Geomagnetic coordinates CGMS Coordinating Group for Meteorological Satellites CGSIC Civil GPS Service Interface Committee CGU Canadian Geophysical Union Ch mkr Channel marker Ch Channel CHAP Challenge Handshake Authentication Protocol (PPP) CHATH Chemically/Biologically Hardened Air Transportable Hospital CHBDL Common High Bandwidth Data Link CHBDL-ST Common High Bandwidth Data Link-Surface Terminal C-HFET Complementary Heterostructure Field Effect Transistor CHI cloud-height indicator CHINO sky condition at secondary location not available CHOP (1)Change in Operational Control CHOP (2)Chief Operator (Navy MARS) CHOP (3)Counter Measures Hands-on Program CHS Combat health support CHS Cylinder, Head, Sector (direct disk addressing) CIA Central Intelligence Agency (US) CIBAR Conference of International Broadcasters' Audience Research Services CIC (1) Combat Information Center (Navy) CIC (2) Combined Intelligence Center (US Air Force) CIC (3)Combined Intelligence Center CICA Competition in Contracting Act CICBMs Conventionally-armed ICBMs CICS Customer Information Control System (IBM) CID (1)Circuit Identifier CID (2)Combat Identification CIDE Communication Information Data Exchange CIDR Classless Inter-Domain Routing (Internet, replaces class A-C) CIDX Canadian International DX Club CIG ceiling CIIP Common Imagery Interoperability Profiles CIJ Close In Jamming CIL Command Image Library CINC Commander In Chief, replaced by CDR 2003 CINCLANT C in C, Atlantic, obsolete CINCNORAD C in C, NORAD, obsolete CINCPAC C in C, Pacific, obsolete CINCSTRAT C in C, Stratcom, obsolete CIOL Common Interface Objects Language CIPO Commanders in chief Interoperability Program Office CIPSO Common Internet Protocol Security Options CIRC Cross Interleaved Reed Solomon Code CIRAF French acronym for international broadcast zone system CIRF Co-Channel Interference Reduction Factor CIS (1)Combat Intelligence System CIS (2)Commonwealth of Independent States (replaced USSR) CISC Complex Instruction Set Computing CISCO Consolidated intelligence support to combat operations CISPR International Special Committee on Radio Interference CIT California Institute of Technology (CalTech) CITS Combat Information Transfer System CI-V Radio computer interface made by Icom CIW Combined Intelligence Watch CIWS Close-In Weapons System CJCS Chairman, Joint Chiefs of Staff (US) CJCSI Chairman of the Joint Chiefs of Staff Instruction CJCSM Chairman of the Joint Chiefs of Staff Memo CJFET Complementary junction field effect transistor CJMAO Central Joint Mortuary Affairs Office CK Check (usually word count in a message) CL (1)Centerline Lighting System CL (2)CW prosign: I am closing my station (clearing) Class A (1)Stage is biased to conduct continuously Class A (2)High explosive (military phone patches) Class B Stage is biased to conduct on half of cycle Class C (1)Stage is biased to conduct less than half Class C (2)Gunpowder (military phone patches) Class D Digital switching Class E New, like D CLC Circuit Link Control Clg Calling CLIPER CLImatology and PERsistence (weather model) CLOVER Robust RTTY mode for HF CLR (1)Clear CLR (2)Clear below 12,000 feet (automated METAR) CLR (3)Common Language Runtime (MickeySoft) CM (1)Countermeasures CM (2)Cipher Machine CM (3)Corrected Geomagnetic coordinates CM (4)Chemical Mace, a tear gas CM (5)Configuration Management cm (1)Centimeter cm (2)Control monitor CMARS Cruise Missile Autonomous Routing System CMAS Cheyenne Mountain Air Station, was CMAFB, CMAFS CMAWS Common Missile Approach Warning System CMC (1)Cheyenne Mountain Complex (NORAD) CMC (2)Command management center CMC (3)COMSAT Mobile Corporation, part of COMSAT CMCS COMINT Mission Collection System CMD (1)Command CMD (2)Network Command (ALE) CMDR Commander CMDS Countermeasure Dispenser Set CME Coronal Mass Ejection, causes aurora CMF Combat Mission Folder CMI Computer-managed instruction CMIS (1)Cheyenne Mountain Interface Subsystem CMIS (2)Closed Loop Maintenance Information System CMLSA Commercial Microwave Landing System Avionics CMO (1)Central Measurement and Signature Intelligence (MASINT) Office CMO (2)Civil-military operations CMOC Cheyenne Mountain Operations Center CMOS (1)Complementary Metallic Oxide Semiconductor CMOS (2)Cargo Movement Operations System CMP Common Management Practices CMR Crisis Management Reconnaissance CMRS Commercial Mobile Radio Service CMS (1)Canadian Maritime Service CMS (2)Calendar Messaging Service (Solaris) CMS (3)Common Mapping System CMS (4)Community Management Staff CMS (5)Counter Measures Set CMS (6)Counter Measures System CMSA Cruise Missile Support Activity CMT Cellular Mobile Telephone CMU Cheyenne Mountain Upgrade CMX Crisis Management Exercise (NATO) CMY Cyan, Magenta, Yellow (subtractive color printing) CMYK Cyan, Magenta, Yellow, blacK (4-color printing) CN (1)Communications network CN (2)Counter-narcotics CNA Center for Naval Analysis CNAAS Counter-narcotics air analysis system CNCE Communications nodal control element CNCS Centralized Net Control Station (Scope Command hub at Andrews AFB) CNE (1)Communications Network Environment CNE (2)Communications Node Emulator CNE (3)Certified Netware Engineer (Novell) CNES Centre National d'Etudes Spatiales (French space agency) CNI Communications, Navigation, and ID CNM (1)Communications Network management CNMI Commonwealth of the Northern Mariana Islands CNN Cable News Network CNO (1)Chief of Naval Operations CNO (2)Casualty notification officer CNR Combat Net Radio CNRADL Canadian RADIL (ROCC/AWACS digital information link) CNS (1)Communications, navigation & surveillance CNS (2)Central nervous system CNS (3)Consolidated NOTAM System (Another nested acronym courtesy FAA) CNTRA Chief of Naval Air Training (pronounced "Sinatra" like the singer) CO (1)Commanding Officer CO (2)Central Office (telcom) CO (3)Contracting Officer co UK version of .com (Internet domain) CO/MIS Commander, Management Information Center COA Courses of Action Coax Coaxial cable COBOL Common Business Oriented Language (clunky old programming code) COBRA DANE US military air surveillance radar system COBRA (1)Coastal Battlefield Reconnaissance System COBRA (2)Counter Battery Radar COBRA (3)Coaxial Beam Rotating Antenna COCOM Combatant command COD (1)Carrier Onboard Delivery COD (2)Collect On Delivery CODAR Coastal Ocean Dynamics Radar CoDE Coherent Digital Exciter Codec Coder/Decoder COE (1)Circle of Error COE (2)Common Operating Environment COE (3)Central Office Equipment COFAS Commandement Force Aerienne Strategique (French AF) COFC Container On Flat Car (as opposed to container car) COFF Common Object File Format (Windoze) CofS Chief of Staff COG Continuity Of Government (emergency plan) COI Critical Operational Issue COIL Chemical Oxygen-Iodine Laser COL Colonel COM (1)Computer file extension: load as simple command program COM (2)Commercial domain (Internet) COM (3)Component Object Module (Windoze) COMACC Commander, Air Combat Command COMAFFOR Commander Air Force Forces COMAFSPACE Commander, Air Force Space Command COMARSPACE Commander, U.S. Army Space Command COMASWFORLANT Commander, ASW Forces Atlantic COMCON Communications Condition (MARS) COMFAIRMED Commander, Fleet Air Mediterranean COMFAIRWINGTEN Commander, Fleet Airwing Ten COMHSWINGONE Commander, Helicopter Antisubmarine Wing One COMINT Communications Intelligence COMJAM Communications jamming COMM Communications Comm Communications (also "commo") COMMSTA Communication Station COMMZ Communications zone COMNAVCOMTELCOM Commander, Naval Computer and Telecommunications Command COMOPTEVFOR Commander, Operational Test and Evaluation Force COMPATWING Commander, Patrol Wing COMPATWINGSLANT Commander, Patrol Wings Atlantic COMPUINT Computer intelligence Compul Compulsory COMPUSEC Computer Security COMSAT (1)COMmunication SATellite COMSAT (2)Comsat Corp., US consortium & INMARSAT Convention rep COMSEABASED Commander, Sea-Based ASW Wings, Atlantic COMSEC Communication Security COMSTAT Communications Status Report COMSUBLANT Commander, Submarine Forces, Atlantic (USN) COMSUBPAC Commander, Submarine Forces, Pacific (USN) COMTAC Communications Tactical CONCISE Cosine Network's Central Information Service for Europe CONDX CW brevity: propagation conditions (usually wretched) CONELRAD Control of Electromagnetic Radiation, obsolete Config Configuration, configure conmara Italian Consulate, Maracaibo, Venezuela conmars Italian Consulate, Marseille, France conmopr Italian Consulate, possibly Montpellier, France conmpla Italian Consulate, Mar del Plata, Argentina CONOP(s) Concept of Operations(s) CONS continuous conspie Italian Consulate, possibly St. Pierre contolo Italian Consulate, Toulouse, France CONUS continental United States conwett Italian Consulate, Wettingen, Switzerland COOP Continuity Of Operations (US Army) Coq Coquelet (French teleprinting system, after "Rooster") Coq8 8-bit Coquelet COR (1)Carrier operated relay COR (2)Consolidated Operations Room ("Lights Out") COR (3)Correction to a previously disseminated weather report CORES Commission Registration System (FCC) COS Communication Operations Segment COSCOM Corps support command COSE Common Open Software Environment COSIP Computer Open System Interface Processor COSPAS Acronym for Russian SARSAT COT Changeover time COTHEN Customs Over The Horizon Enforcement Network (US) COTS Commercial Off-The-Shelf COWS Cells On Wheels (post-disaster cellphone service) CP (1)Command Post CP (2)CW general call: "Hello -- [2 or more callsigns follow]" CP (3)Contental Polar (air mass) CP/M Early Z80 operating system, might or might not have stood for "Control Program for Microcomputers," or "Control Program/Monitor." The guy who would know is dead, having narrowly missed out on being richer than Bill Gates. CPA (1)Closest Point of Approach CPA (2)Certified Public Accountant CPAS Cellular Priority Access Service CPCA Camp Parks Communications Annex (USAF) CPDLC Controller-Pilot Data Link Communications CPE Customer Premise Equipment (telco) CPFSK Continuous-Phase Frequency Shift Keying CPM Continuous Phase Modulation CPO Chief Petty Officer CPR Cardio-pulmonary resuscitation CPS (1)Characters Per Second CPS (2)Cellular Priority Services (US NCS) cps Cycle per second (one Hertz) CPT Captain (US Army) CPU Central Processing Unit (computer h/w) CPX Command Post Exercise (NATO) CQ General call: "Hello all stations" CQD "Hello All Stations, Distress," no longer used CQWW CQ World Wide (Amateur DX contest) CR Carriage Return CRAF Civil Reserve Air Fleet CRATT Crypto Radio Teletype (usually military & encrypted) CRC (1)Cyclic Redundancy Check (computer error test) CRC (2)CONUS Replacement Center CRC (3)Control & Reporting Center CRE Control & Reporting Element CREN Corporation for Research and Educational Networking CRIS Communications Resource Information Sharing (US NCS) CRM Computer Resource Management CRO (1)Cathode-Ray Oscilloscope CRO (2)Croatia (country code) CRO (3)Coaxial Resonator Oscillator CROSS Centres Regionaux Opérationnels de Surveillance et de Sauvetage (French RCC, see RCC) CRPLF French language: Francophonic Public Radio Community CRR Carrier CRRL Canadian Radio Relay League CRS Coastal Radio Station CRT Cathode-Ray Tube (usually a computer terminal) CRTC Combat Readiness Training Center CS (1)combat support CS (2)communication squadron CS (3)Chicken S-it CS (4)Chemical Shield (a tear gas) CSAF Air Force Chief of Staff CSAR Combat Search and Rescue CSARP Common SAR Processor CSB Corps support battalion CSC (1)Combat Support Center (AFOC) CSC (2)Combat stress control CSC (3)Computer Software Component CSCI Computer Software Configuration Item CSE Client/Server Environment CSEL Combat Survivor Evader Locator (pilot survival radio) CSG (1)Carrier Strike Group CSG (2)Corps support group CSH Combat support hospital csh C-shell, popular Unix command interpreter CSMA/CD Carrier Sense Multiple Access/ Collision Detection CSOM Computer Software Operators Manual CSP Communications Support Processor C-SPAN Cable-Satellite Public Affairs Network (US) CSS (1)Combat service support CSS (2)Central Security Service (US SIGINT, run by NSA director) CSS (3)Cascading Style Sheets CSS (4)Content Scrambling System (DVD encryption) CSSCS Combat Service Support Control System CST (1)Central (US) Standard Time CST (2)Caribbean Support Tender CST (3)Civil Support Team CSTARS COMBAT SENT Technical Acquisition Receiver System CSU Computer Software Unit CT (1)Center Tap CT (2)("Charlie Tango") - Communications Technician (on an aircraft) CTA Control Area CTAF Common Traffic Advisory Frequency CTAPS Contingency Tactical Air Combat System CTBT Comprehensive Test Ban Treaty CTC Centralized Traffic Control (railroad) CTCSS Continuous Tone Coded Squelch System ("PL") CTI Computer - Telephone Integration CTIA Cellular Telecommunications Industry Assn CTLZ Control Zone CTP Critical Technical Parameter CTR Combat Training Range Ctrl (1)Control Ctrl (2)Computer's control key, sometimes shown with a ^ CTS Clear To Send (Serial I/O handshaking line) CTT Commander's Tactical Terminal CU CW brevity code: "See you" CUAGN CW brevity code: "See you again" CUBIC Common User Baseline for the Intel Community CUCV commercial utility cargo vehicle CUL CW brevity code: "See you later" CV (1)USN Aircraft Carrier CV (2)Vice Commander CVBG Carrier Battle Group CVIC Carrier Intelligence Center CVN US nuclear aircraft carrier CW (1)Continuous Wave (usually Morse code) CW (2)Clockwise (rotation) CW (3)Composite Wing CWDE Chemical Warfare Defense Ensemble CWIS Campus-Wide Information System CWISP Campus-Wide Information System Protocol CWOC Composite Wing Operations Center CWP Central West Pacific (MWARA) CWS Combat Weather System Cygnus Cygnus, Your Gnu Support (nested recursion; see Gnu) CZ (Panama) Canal Zone D (1)Down D (2)Diode D/A Digital/Analog converter D/L (1)Downlink D/L (2)Download D2 Degrade and Destroy D2C D-2 Small Cassette D3 Degrade Disrupt Deny D4 (1)Degrade Disrupt Deny Destroy D4 (2)Deny, Disrupt, Degrade, & Destroy D4EN Disrupt, Delay, Destroy, Exploit, or Neutralize DA (1)Directional antenna DA (2)Department of the Army DA-2 Station changes directional pattern at night (FCC) DAC (1)Digital-to-Analog Converter DAC (2)Disaster Assistance Center (FEMA) DAC (3)Disaster Application Center DACT Data Automated Control Terminal DAE Disaster Assistance Employee DAGS Data Architecture and Gateway Services dah Morse code dash [~] DAMA Demand Assigned Multiple Access D-AMPS Digital Advanced Mobile Phone System DAMSON Doppler And Multipath Sounding Network DAQCS (1)Distress Alert Quality Control System DAQCS (2)Data Acquisition and Quality Control System DARN (1)Dual Auroral Radar Network DARN (2)Disaster Amateur Radio Network, SoCal 440 MHz system DARO Defense Airborne Reconnaissance Office DARP Defense Airborne Reconnaissance Program DARPA Defense Advanced Research Projects Agency DARTS Dynamic Avionics Real-Time Scheduling DAS Data Aquisition System DASR Digital Airport Surveillance Radar DAT Digital audio tape DAWS Defense Automated Warning System DB (1)Directional Beacon DB (2)Dead body dB Decibel (1/10 Bel, a logarithmic voltage or power ratio) dBA Sound level (corrected to "A" scale dB) dBc Decibels referenced to full-rated peak envelope power DBCS Double byte character set dBd Decibel gain over dipole antenna dBi Decibel gain over (theoretical) isotropic antenna dBic Db gain over circular isotropic DBM (1)Doubly balanced mixer DBM (2)Data Block Message dBm Decibels over 1 mW into 50 ohms, usually rf, 0 dBm = 0.316 Vp DBMS Data Base Management System DBPSK Differential Binary Phase-Shift Keying DBS Direct broadcasting satellite (system) dBW Db over one watt DC Direct Current DC1 Device Control 1 (ASCII flow control) DC2 Device Control 2 (ASCII) DC3 Device Control 3 (ASCII flow control) DC4 Device Control 4 (ASCII) DCA (1)Defense Communications Agency (now DISA) DCA (2)Defensive counter Air DCA (3)Dual-Capable Aircraft DCAC Defense Communications Agency Circular (now DISA) DCD Data Carrier Detect (packet modems) DCDR Deputy Commander DCE (1)Data Communication Equipment (like a modem) DCE (2)Distributed Computing Environment DCG Deputy commanding general DCI (1)Defensive Counter Information DCI (2)Director of Central Intelligence DCID Director of Central Intelligence Directive DCO Defense Coordinating Officer DCOM Distributed Component Object Model (Windoze) DCP (1)Data Collection Platform DCP (2)Defense Cryptologic Program DCPA Defense Civil Preparedness Agency, now FEMA DCR Direct Conversion Receiver ("Homodyne") DCS (1)Defense Communications System DCS (2)Disaster Communications System, amateur, from RACES DCS (3)Digital Coded Squelch DCS (4)Distributed Control Systems DCT (1)Digital Communications Terminal DCT (2)Direct Cosine Transform DCTN Defense Commercial Telecommunications Network DCW Digital Chart of the World DD Dual Diversity DDD Maritime preamble for relayed distress message DDDS Defense Data Dictionary System DDM DoD Data Model DDN Defense Data Network DDNS Dynamic Domain Naming System/Server (Internet) DDO Dynamic Drive Overlay (used by Disk Manager on the PC) DDPO Defense Dissemination Program Office DDR Dual Diversity Receiver DDRS Defense Data Repository System DDR Double Data Rate (memory) DDS (1)Direct Digital Synthesis DDS (2)Defense Dissemination System DDT (1)Delay/Denial Technology DDT (2)Dynamic Debugging Tool, named for old pesticide DE Morse code prosign meaning "from" DEA Drug Enforcement Administration (US) DEC Digital Equipment Corporation, made some nice computers DECCA Low-frequency CW phase comparison navigation DECM Deceptive Electronic Countermeasures DECnet DEC's name for networking protocols and products DECT Digital European Cordless Telecommunications DEFCON DEFense CONdition, 1-5; 5 is peace, 1 is global thermonuclear war (STRATCOM) DEMIZ DEW East Military Identification Zone DEPCON Departure Control DE-QPSK Differentially Encoded Quaternary Phase Shift Keying DES Data Encryption Standard DES-FED Stronger (108 bit) DES used by US government Det Detector DEW Distant Early Warning (radar in Canada) DF (1)Direction finding DF (2)Direction finder ("duffer") DF (3)Damping Factor DFAD Digital Feature Analysis Data DFAS Defense Finance and Accounting Service DFCC Digital Flight Control Computer DFCS Digital Flight Control System DFCW Dual-Frequency Continuous Wave DFO Disaster Field Office DFRC Dryden Flight Research Center (NASA) DGM Digital group multiplexer DGPS-MSK Differential GPS, Minimum Shift Keying DGPS-QPSK DGPS-QPSK : Differential GPS, Quarternary Phase Shift DGS Deployable Ground Stations DHCP Dynamic Host Configuration Protocol DHS Department of Homeland Security DHTML Dynamic Hypertext Markup Language (web) DIA Defense Intelligence Agency DIAC Defense Intelligence Analysis Center DIAL Differential Absorption Lidar DIAM Defense Intelligence Agency Manual DICE Data Integration & Collection Environment DIDOP Digital Image Data Output Product Differential GPS, Quarternary Phase Shift Keying DIG Domain Internet Groper DIGEST Digital Geographic Information Exchange Standard DIGI ~ Digipeater, simplex digital repeater DII Defense Information Infrastructure DIMM Double In-line Memory Module DIMMS Double In-line Modular Memory System DIN German standards agency DIOP Data Input/Output Port DIP Dual In-line Package (chips or small switches) Diplo Diplomatic traffic, usually encrypted DIPS Digital Image Processing System DIRCM Directed Infrared Countermeasures DIRMOBFOR Director of Mobility Forces DIS (1)Defense Investigative Service DIS (2)Distributed Interactive Simulation DIS (3)Distributed Interactive System DIS (4)Draft International Standard DIS (5)Daily Intelligence Summary DIS (6)Data and Information System DIS (7)Defense Information System DIS (8)Defense Intelligence Service DISA Defense Information Systems Agency DISAC Defense Information Systems Agency Circular DISC Packet control frame: Disconnect DISCO Defense Industri+al Security Clearance Office DISCOM Division support command DISN Defense Information Systems Network dit Morse code dot [~] DITAW Detect, Identify, Track, Assesment, & Warn DIW Dead in the water DIWSA Digital Imagery Workstation Suite Afloat DJ Deceptive Jamming DJBDNS Daniel J. Bernstein DNS (more secure than BIND) DL (1)Download DL (2)Data Link DL (3)Driver's License (police) DLA Defense Logistics Agency DLC Data Link Control DLE Data Link Escape (ASCII) DLL Dynamically Linked Library (computer programs) DLQ Deck Landing Qualification DLRP Data Link Reference Point, a USN authenticator DM (1)Delay Modulation (Miller Coding) DM (2)Packet control frame: Disconnect Mode (busy) DMA (1)Direct Memory Access DMA (2)Defense Mapping Agency DMAAC Defense Mapping Agency Aerospace Center DMAHC Defense Mapping Agency Hydrographic Center DMAHTC DMA Hydrographic Topographic Center DMAL Defense Mapping Agency List DMAT Disaster Medical Assistance Team DMATC Defense Mapping Agency Topographic Center DMC Defence Management Committee (Canada) DMCA Digital Millennium Copyright Act DMD Digital Micromirror Device DME Distance Measuring Equipment (airport approach) DMI Depot Maintenance Interservicing DMSO Defense Modeling and Simulation Office DMSP (1)Distributed Mail System Protocol DMSP (2)Defense Meteorological Satellite Program DMT Discrete Multi-Tone DMTD Digital Message Transfer Device DMTF Distributed Management Task Force DMUX Demultiplexer DMZ Demilitarized Zone (Korea) DN (1)Dutch (Royal) Navy DN (2)Directory Number (telco) DNC Digital Nautical Chart DNCC Deployed Network Control Center DND Department of National Defence (Canada) DNS Domain Naming System/Server (Internet) DNSSEC DNS Security DO design objective DOA Dead On Arrival DOB Date Of Birth (police) DOC (1)Department of Commerce (US) DOC (2)Department Of Communication (Canadian "FCC") DoD Department of Defense (US) DoDD Department of Defense Directive DoDIIS (1)Defense Intelligence Information System DoDIIS (2)DOD Intelligence Information System DODISS (3)Department of Defense Index of Specifications and Standards DoDISS (4)DoD Index of Specifications and Standards DoDSI Department of Defense Security Institute DoDSSP DoD Single Stock Point DOE Department Of Energy (US) DOI Department Of the Interior (US) DOJ Department Of Justice (US) DOMS Director Of Military Support (MARS) DOS (1)Department of State (US) DOS (2)Disk Operating System (generic) DOS (3)MS-DOS (proprietary PC op-sys) DOS (4)PC-DOS, IBM version of above, obsolete? DOS (5)Denial of Service (attack) DOT Department of Transportation (US) DOW Doppler On Wheels (storm chasing radar equipment) DP Development Prototype DPCA Displaced Phase Center Antenna DPCM Differential Pulse Code Modulation DPDT Double-Pole, Double Throw DPG Defense Planning Guidance DPL Diode-Pumped Laser DPSK Differential Phase-Shift Keying DPST Double-Pole, Single-Throw dpx Duplex DQPSK Differential Quadrature Phase-Shift Keying DR low drifting DRAC Dynamic Relay Authorisation Control DRAM Dynamic Random Access Memory DRE Drug Recognition Expert DRFM Digital Radio Frequency Memory DRFMU Digital Radio Frequency Memory Unit DRM (1)Digital Radio Mondiale DRM (2)Digital Rights Management DRO Dielectric Resonator Oscillator DRS Deployable Red Switch DRSN Defense RED Switch Network DS (1)Direct support DS (2)Dust storm DSA Division support area DSA/SMC Deputy for Systems Acquisition/Systems Management Center DSB Double sideband DSC Digital Selective Calling (GMDSS) DSI Defensive Simulation Internet DSL Digital Subscriber Line DSLAM Digital Subscriber Line Access Multiplexer DSM Digital Switching Module DSN Defense Switched Network (old AUTOVON) DSNET Defense Secure Network DSNT distant DSOR Depot Source of Repair DSP Digital signal processing DSR Data Set Ready (Serial I/O primary handshaking line) DSRC Dedicated Short Range Communications DSS Digital Satellite System Dst Disturbance Storm Time, equatorial magnetospheric activity index DSTO Defence Science & Technology Organisation (Australia) DSVD Digital Simultaneous Voice and Data DSVT Digital Subscriber Voice Terminal DSW Russian CW brevity code: "Daswedanya" (Goodbye) DT (1)District T (USCG) DTAC Division tactical command post DTC Design to Cost DTD Data Transfer Device DTE Data Terminal Equipment (computers, workstations, dumb terminals) DTED Digital Terrain Elevation Data DTG Date time group (typically ddhhmm mon yy tz) DTIM Delivery Traffic Indication Message DTM (1)Data Text Message DTM (2)Data Transfer Module DTM (3)Digital Technology Model DTMF Dual Tone Multi Frequency (like telco "touch tone") DTMF-RA Dual Tone Multi-Frequency - Remote Access DTO Division tactical operations center DTOP Digital Topographic Data DTR Data Terminal Ready (Serial I/O primary handshaking line) DTS (1)Digital Transmission System (Euro radio e-mail s/w) DTS (2)Data Terminal Set DTS (3)Digital Terrain System DTSS Digital Terrain Support System DTT Digital Terrestrial Television DTV Digital television DU (1)widespread dust (weather) DU (2)depleted uranium DUATS Direct User Access Terminal System DUP-ARQ Hungarian diplomatic teleprinting system DUPE CW prosign: message or contact is a duplicate DUSD Deputy Undersecretary of Defense DUT1 UTC correction interval to get UT1 DV Distinguished Visitor DVA Department of Veterans Administration DVD Digital Versatile Disk DVFR Defense Visual Flight Rules DVI Digital Video Interface DVM Digital Voltmeter DVMT Dynamic Video Memory Technology DVP (1)Distinguished Visitor Protocol (US Air Force DVP (2)Digital Voice Protection (Motorola DES mode) DW Deutsche Welle DX (1)Distant Transmitter. The distance can be either geographic or psychological. DX (2)First transmission of FEC character DX (3)Duplex DXAC DX Advisory Committee (ARRL) DXCC Coveted amateur radio award, for confirming at least 100 countries DXing The hobby of listening to distant radio or television DZ (1)Drop zone DZ (2)drizzle DZST Drop Zone Support Team E (1)Electromotive force (in volts) E (2)east, ended E (3)E-region (middle zone of ionosphere) E (4)Electric field EA (1)East Asia (MWARA) EA (2)Electronic Attack EAC Echelons above corps EAD Echelons above division EAF Expeditionary Airfields EALS Emergency Airfield Lighting System EAM Emergency Action Message EARN European Academic and Research Network EAS (1)Emergency Alerting System, replaced EBS EAS (2)Equivalent Air Speed EAS (3)Electronic Article Surveillance EBB Electronic bulletin board EBC Emulated buffer computer EBCDIC Extended Binary Coded Decimal Interchange Code, old IBM EBIOS Enhanced Basic Input/Output System (PCs with disks over 540 meg) EBONE A pan-European Backbone service EBS Emergency Broadcasting System, replaced CONELRAD EBU European Broadcasting Union EC (1)Electronic Combat EC (2)Emergency Coordinator ECB Echelons corps and below ECC (1)Error Correction Code (better than parity) ECC (2)Error Checking & Correcting (memory chip) ECC (3)Error Control Coding ECCM Electronic Counter-Countermeasures ECCO Electronic Combat Coordination Officer ECDIS Electronic Chart Display and Information System ECDIS-N Electronic Chart Display and Information System-Navy ECHS Extended Cylinder, Head, Sector (addressing) ECM (1)Electronic countermeasures ECM (2)Electronic Cipher Machine ECOM Emergency Communications ECRS East Coast Radar System ed Edit; any of several funky line editors for old printing TTYs connected to computers EDC Error Detection Code EDD Electronic Document Delivery EDFMCM Environmental Data Fusion for Mine Countermeasures EDGE Enhanced Data Rates for Global Evolution (telephony) EDI Electronic Document Interchange EDO Extended Data Output (memory chip) EDP Electronic Data Processing EDPT Enhanced (fixed) Disk Parameter Table EDR Enhanced Data Rate EDS Explosives Detection Systems EDSAC Electronic Delay Storage Automatic Calculator (1949) EDT Eastern (US) Daylight Time edu Educational Institution domain (Internet) EDVAC Electronic Discrete Variable Computer (1945) EE (1) Transmission is in English EE (2) Person with Electrical Engineering degree EEC European Economic Community EECEN Electronics Engineering Center, NJ (USCG) EEFI Essential Elements of Friendly Information (COMSEC) EEFI 1 Position (notification prepended by ZNX) EEFI 2 Capabilities EEFI 3 Operations EEFI 4 Electronic Warfare EEFI 5 Personnel EEFI 6 COMSEC breach EEFI 7 Wrong circuit used EEFI 8-10 Spare EEI Essential Elements of Information (Federal report form) EEJ Equatorial Electrojet, might cause trans-eq spread-f propagation EEPROM Electronically Erasable Programmable Read Only Memory EEZ Exclusive Economic Zone ("200-mile limit") EFAS Enroute Flight Advisory Service EFF Electronic Frontier Foundation, Internet free speech group EFFI Essential Elements of Friendly Information EFTO Encrypted for transmission only EGC Enhanced Group Call (GMDSS) EGP Exterior Gateway Protocols EGPRS Enhanced General Packet Radio Service EGS European Geophysical Society E-HA Enroute High Altitude EHS External Hostile Structured threat EHU External Hostile Unstructured threat EI-232 Latest name for RS-232, the serial interface standard EIA (1)Electronic Industries Association, replaced RETMA EIA (2)Equatorial Ionization Anomaly EICC Emergency Information and Coordination Center (FEMA) EIDE Enhanced Integrated Drive Electronics, ATA version once proprietary to WD EIG External Interface Gateways EINE EINE Is Not Emacs (recursive acronym; see Emacs) EIP ELINT Improvement Program EIRP Equivalent Isotropically Radiated Power EIS Enhanced Imaging System EISA Extended Industry Standard Architecture EISCAT European Incoherent Scatter Radar (research) E-LA Enroute Low Altitude ELF (1) Extremely Low Frequency (30-300 Hz) ELF (2) US military comm system using same ("Project Elf") ELINT Electronic Intelligence elm ELectronic Mailer (Unix) ELSEC Electronic Security ELT Emergency Locator Transmitter ELV Expendable Launch Vehicle EM (1)Electromagnetic EM (2)Extended mission EM (3)Emergency management EM (4)End of Medium (ASCII) Emacs Editing Macros, powerful if ungainly, Unix text editor E-mail Electronic mail, usually by computer EMC Electromagnetic compatibility EMCON (1)Electromagnetic Radiation Control EMCON (2)Emission Control (radio, etc, not smog) EMCS ELINT Mission Control System EME (1)Electromagnetic energy EME (2)Earth-Moon-Earth (VHF/UHF "moonbounce") EMF Electromotive force (back-EMF occurs in coils & motors) EMI Electromagnetic incompatibility EMP Electromagnetic pulse EMS (1)Extended Memory Specification (IBM PC, old LIM spec) EMS (2)Emergency Medical Services EMSEC Emanations Security EMT Emergency Medical Technician, public safety certificate EMWIN Emergency Manager's Weather Information Center ENE East-northeast ENF ELINT Notation File engr engineer ENIAC Electronic Numerical Integrator And Computer, 1940s vacuum tube calculating machine ENIGMA (1) European Numbers Information Gathering & Monitoring Assn ENIGMA (2)[~]Historic German crypto machine, WW II code broken by Allies ENJEP Euro-Nato Jet Pilot Training (at Sheppard AFB) ENQ (1)Enquiry, sent by computer to get ACK/NAK response (ASCII 05) ENQ (2)Enquiry (Like Who Are You?) ENS External Non-Hostile Structured threat ENTNAC Entrance National Agency Check ENU External Non-Hostile Unstructured threat EO Electro-Optical EO/IR Electro-Optical/Infrared EOB Electronic Order of Battle EOC Emergency Operations Center EOD Explosive Ordnance Disposal, the bomb squad EOL End of (design) life EO-LOROPS Electro-Optical Long Range Oblique Photography System EOP Emergency Operations Plan EOS Earth Observing System EOT (1)End Of Transmission EOT (2)End Of Tape EOW End Of Watch EP Electronic Protection EPA Environmental Protection Agency EPIC El Paso Intelligence Center (US Customs) EPIRB Emergency Position Indicating Radio Beacon EPL ELINT Parameter List EPLRS Enhanced Position Location Reporting System EPROM Electrically Programmable Read-Only Memory EPS (1)Emergency Planning Subcommittee EPS (2)Enhanced Processing Segment EPS (3)GOES Energetic Particle Sensor, measures solar flares EPU Emergency Power Unit EPW Enemy prisoner of war ER (1)Eastern Range ER (2)Emergency room ERASER Enhanced Recognition & Sensing Radar ERFAK Emergency Response Fly-Away Kit (US Govt) ERLink Emergency Response Link (US Govt) ERMA Electronic Recording Machine Accounting (1959, first check reader) erp Effective radiated power ERPS External Frequency Interference Protection System ERT Emergency Response Team (FEMA) ERT-A Advance Element of the Emergency Response Team (FEMA) ERTS Earth Rotation Time Service, keeps track of planet's actual position in space ES (1)Electronic Support ES (2)CW brevity code: "And" ES (3)Sporadic E propagation, or clouds making same ESA European Space Agency ESC (1)Enhanced Satellite Capability (US NCS) ESC (2)Escape (computer character) ESE East-southeast ESF Emergency Support Function (part of NTSP; 1-12) ESM Electronic Support Measures ESMC Eastern Space & Missile Center ESMTP Extended Simple Mail Transfer Protocol (does this mean it's no longer simple?) ESN Electronic Serial Number ESS (1)Electronic Switching System (landlines) ESS (2)Electronic Scoring Site EST (1)Eastern (US) Standard Time EST (2)Emergency Support Team (FEMA) ET (1)Extra-terrestrial ET (2)External Tank (NASA) ET (3)Eastern Time (US) ETA Estimated time of arrival ETB End of Transmission Block ETD (1)Estimated time of departure ETD (2)End-of-Train Device ETD (3)Explosives Trace Detection ETLA Extended Three-Letter Acronym (a four-letter acronym) ETOH Alcohol (for some reason, paramedics say the chemical name) ETRAC Enhanced Tactical Radar Correlator ETSI European Telecommunications Standards Institute ETX End Of Text (ASCII) EUCOM European Command Eunet European part of UUCP, Unix file transfer network EUR Europe (MWARA) EUV Extreme ultraviolet (can ionize) EVS Electro-Optical Viewing System EW Electronic warfare EWIR Electronic Warfare Integrated Reprogramming EWMS Electronic Warfare Management System EWN Evangelical World Network, operates WEWN EWO (1)Electronic Warfare Officer (backseater) EWO (2)Emergency War Order EWPE EW Processing Element EWR Early Warning Radar EWS Early Warning System EXE Computer file extension: loads as executable EXE2BIN PC program for creating .COM files from .EXE f Frequency (in Hertz) F (1)Farad (a huge capacitor; usually uf or pf) F (2)F-region, highest zone of ionosphere F1 (1)In daytime, lower layer of F region F1 (2)Frequency number one (F2, F3...) F2 In daytime, upper layer of F region F/B Front to back ratio (antennas) F/O (1)Fiber optics F/O (2)Follow-on F/V Fishing Vessel F/W Fixed wing (airplane) F0 FM carrier, no modulation, sounds just like A0, now N0N F1B Mode designator: frequency shift keying F2B Mode designator: Audio frequency-shift keying F3C Mode designator: fax F3E Mode designator: FM voice or broadcasting FAA (1)Federal Aviation Administration (US) FAA (2)Foreign Assistance Act FAAA General call: "All French warships" [~] FAADC3 Forward Area Air Defense Command, Control, Communications Intelligence System (US Army) FAC (1)Field-Aligned Current, an irregular propagation mode FAC (2)Forward Air Controller FACSFAC Fleet Area Control & Surveillance Facility (US Navy) FADEC Full Authority Digital Engine Control FAE Fuel Air Explosive FAF (1)Fast Access Format FAF (2)French Air Force FAGDS Federation of Astronomical and Geophysical Data Services FAI Field-Aligned Irregularities, like FAC FAM Federal Air Marshal FAPSI Federal Agcy for Govt Comm & Info (Russian, replaced KGB) FAQ Frequently Asked Questions (Internet/USENET) FAR Federal Aviation Regulations FARP Forward Arming & Refueling Point FAS (1)Frequency Assignment Subcommittee (of IRAC) FAS (2)Federation of American Scientists FASC Forward area signal center FAST (1)Field Assessment Team (FEMA) FAST (2)Fleet Antiterrorist Strike Team (US Marines) FAST (3)Fast Auroral Snapshot Small Explorer satellite (NASA) FAST Field Adaptable Systems Technology FAT (1)File Allocation Table (MS-DOS) FAT (2)First Article Test FAT32 32-bit File Allocation Table (Newer MS-Windows) FAX Facsimile FB CW brevity code: "Fine Business" (really good) FBI Federal Bureau of Investigation (US) FBO Fixed Base Operator FC funnel cloud FCC Federal Communications Commission FCMP Fleet Composite Broadcast (USCG Honolulu) FCO Federal Coordinating Officer (FEMA) FD (1)Floppy Disk FD (2)Fixed Disk (confusing!) FDD Floppy Disk Drive FDDI Fibre Data Distribution Interface FDK Frequency-Difference Keying FDM Frequency-Division Multiplex FDMA Frequency Division Multiple Access FDPT Fixed Disk Parameter Table FDX Full Duplex FEBA Far East Broadcasting Assn FEC Forward error correction teleprinter system FEC-A One-way traffic FEC teleprinter system FECC Federal Emergency Communications Coordinator FECTOR Teleprinting over radio, mode B FED-STD Federal Telecommunication Standard FEK Frequency Exchange Keying FEMA Federal Emergency Management Agency FEP (1)Front End Processor (computers) FEP (2)FLTSAT EHF Package (Navy) FET Field-effect transistor FEW Few clouds FF (1)French Forces FF (2)Transmission is in French FF (3)Formfeed (ASCII) FFH (1)Fast Frigate Helicopter FFH (2)Fast Frequency Hopping (spread spectrum scheme) FFHT-net Fast-Frequency-Hopping Training net FFRDC Federally Funded Research& Development Center (MITRE Corp.) FFT Fast Fourier transform FG (1)Foreign Government (Foxtrot Golf) FG (2)Fog FGS Federal German Ship FH Field hospital FHWA Federal Highway Administration (US) FI Field Investigation, Field Interview (police) FIA (1)Fibreoptic Industry Association (UK) FIA (2)Federation Internationale d'Automobile (Formula 1 racing) FIBI filed but impracticable to transmit FIFO First in, first out FIGS Figures case (Baudot upper case) figs figures follow FIM Flight Information Manual FINDS Flexible Information Dissemination System FIPS Federal Information Processing Standards FIR (1)Flight Information Region FIR (2)Finite Impulse Response FIRESCOPE Firefighting Resources of Southern California Organized for Potential Emergencies FIRRS FAAR/Iceland Air Defense Remote Rekeying System FIRST (1)Forum of Incident Response and Security Teams (computers) FIRST (2)first observation after a break in coverage at manual station FISIN Foreign Instrument Signals Intelligence FISINT Foreign Instrumentation Intelligence FIST Fleet Imagery Support Terminal (US Navy) FISTA Flying Infrared Signatures Technology Aircraft FITFEEL Fast Information Transfer For Extremely Errored Links FL (1)Flight level FL (2)Focal Length FLAK German: FLeigerAbwehrKannonen (anti-aircraft artillery) FLASER Forward Looking Infrared Laser Radar FLIP Flight Information Publication (US DoD) FLIR Forward looking infrared Flops Floating point operations per second FLOT Forward Line of Own Troops FLOTUS First Lady Of The United States (President's wife) FLR Forward looking radar FLT HICOM Fleet High Command, (US Navy) Flt (1)flight Flt (2)fleet (US Navy) FLTSAT Fleet Satellite, Navy comsat FLTSATCOM Fleet Satellite Communications (US Navy) FM (1)Frequency Modulation FM (2)Field manual FM (3)("Foxtrot Mike") VHF FM (US Navy) FM (4)CW brevity: From FM (5)Field Meteorological FMA-net Frequency Management A-net FMH Federal Meteorological Handbook FMH-1 Federal Meteorological Handbook-1 FMH-2 Federal Meteorological Handbook No.2 FMO Frequency Management Office FMOW FM Orderwire (US military) FMP Fleet Modernization Program FMS Foreign Military Sales FMT-net Frequency Management Training net FN French Navy FNG Friendly new guy/gal (possible security risk) FNPRM Further Notice of Proposed Rule Making (FCC) FOB (1)Field Operations Bureau (FCC) FOB (2)Freight On Board (shipping regs) FOB (3)"Fresh Off the Boat" (humorous) FOD Foreign Object Damage FOIA Freedom of Information Act FOLDOC Free Online Dictionary Of Computing FORSCOM Forces Command FORTRAN Formula Translator (early IBM computer language) FOSIC Fleet Ocean Surveillance & Information Center FOT Optimum Traffic Frequency (fq that will work most days of period) FOUO For Official Use Only FOV Field of View Foxes THE QUICK BROWN FOX... test [~] FPLMTS Future Public Land Mobile Telecommunications Systems FPM Fast Page Mode FPO Fleet Post Office Fq Frequency FQDN Fully Qualified Domain Name (Internet) FQPSK Filtered Quadrature Phase Shift Keying FR (1)Frequency Response FR (2)Final report FRA (1)Forward repair activities FRA (2)Federal Request for Assistance (FEMA) FRA (3)Fixed Radio Access FRCM Federal Regional Coordinating Manager (FEMA) Freq Frequency FRMR Packet control frame: Frame Reject FRN (1)FCC Registration Number FRN (2)Free Radio Network FROPA frontal passage FRP (1)Federal Response Plan (FEMA) FRP (2)Fleet Response Plan FRQ frequent FRS Family Radio Service FS File Separator (ASCII) FS-1037C Official Federal Telecom Glossary, replaced by ATIS FSB Forward support battalion FSBS (Consolidated) Fixed Submarine Broadcast System FSC Full Scope Command (USAF HF Phase II) FSD Federal Security Director FSE Fire support element FSF Free Software Foundation FSK Frequency-shift keying FSL Forecast Systems Laboratory FSM Facility Status Message FSOC Fairchild Satellite Op Center, Fairchild AFB, WA FSP (1)File Service protocol (Internet) FSP (2)File Slurping Protocol FSP (3)Flaky Stream Protocol FSP (4)FTP's Sexy Partner FSRAM Fast Static Random Access Memory FSS Fixed-Satellite Service FST Forward surgical team FSTS Federal Secure Telecommunications System FSU Former Soviet Union FT (1)Terminal Forecast (weather) FT (2)Feet ft foot FTA F--- The Army FTAM File Transfer Access and Management FTG F--- The Guard FTI Fixed Target Indicator FTP File Transfer Protocol FTS Federal Telephone System FTW F--- The World FU Smoke (from French) FUBAR [Fouled] Up Beyond All Recognition FUD Fear, Uncertainty, Doubt (computer marketing technique) FV Fishing Vessel FVLF Fixed, Very Low Frequency FW Fighter Wing (USAF) FWA Fixed Wireless Access fwd forward FWE Fighter Wing Equivalent FWIW For What It's Worth FWOC Fleet Weather and Oceanographic Centre (UK) FY Fiscal Year FYEO For Your Eyes Only FYI For your information FZ freezing FZRANO freezing rain sensor not available G (1)Conductance, reciprocal of R, in mhos, ohm backwards G (2)Gust G/T "G over T", antenna gain divided by noise temperature G1 Asst. Chief of staff, personnel (US Army) G2 Asst. Chief of staff, intelligence (US Army) G3 Asst. Chief of staff, operations and plans (US Army) G4 Asst. Chief of staff, logistics (US Army) G5 Asst. Chief of staff, civil affairs (US Army) G6 Asst. Chief of staff, information mgmt. (US Army) GA (1)CW prosign: go ahead GA (2)CW brevity code: Good Afternoon GaAs Gallium Arsenide GaAsFET Gallium Arsenide Field Effect Transistor GACC Geographic Area Coordination Centers (USFS) GAFRAN Stationary German Air Force GAK Government Access to Key GALEX Galaxy Evolution Explorer (NASA) GaN Gallium Nitride Gantsec Greater Antilles Section (US military/federal, out of Puerto Rico) GAO General Accounting Office (US Government) GATM Global Air Traffic Management GATR ground-to-air transmitter/receiver GATX General American Transportation Corporation, tank & hopper car lessor GBDL Ground Based Data Link GBI Ground-Based Interceptor GBL Ground-Based Laser Gbps Gigabytes per second GBR Ground Based Radar GBS (1)Global Broadcast System GBS (2)Ground Based Sensor GCA Ground Controlled Approach GCAS Ground Collision Avoidance System GCBS Ground Control Bombing System GCC Ground Component Commander GCCS (0)Two different systems: GCCS (1)Global Command Control System, obsolete US Air Force GCCS (2)Global Command & Control System, 1992 data network plan to replace WWMCCS computers GCHQ Government Communication Headquarters ("G;" UK comint) GCMP Guam Composite Broadcast (obsolete USCG) GCN (1)ground communications network GCN (2)ground control network GCSS Global Combat Support System GD CW brevity: Good Day GDIP General Defense Intelligence Program GDO Grid/Gate Dip Oscillator GDOC Geographical Display Operations Computer GDR Ground Data Reduction GDSS Global Decision Support System GE (1)General Electric GE (2)CW brevity: Good Evening GE (3) Guerra Elettronica (Italian for Electronic Warfare) GENSER (1)General Security Regulations GENSER (2)general service GENTEL General Telephone Company GEO Geosynchronous Earth Orbit GEODSS Ground-based electro-optical deep space surveillance GEOS (1)Geodynamic experimental ocean satellite GEOS (2)Geomagnetic earth observation system GEOS (3)Graphic Environment Operating System GEP Ground Entry Point GES Ground Earth Station GETS Government Emergency Telecommunications Service (US NCS) GFA Graphical Area Forecast GFAE Government-furnished aerospace equipment GFDL Geophysical Fluid Dynamics Laboratory GFE (1)Government-furnished equipment GFE (2)God-Furnished Equipment (ionosphere) GFI (1)Government-furnished information GFI (2)Ground Fault Interrupter GFM Government-furnished material GFP (1)Government Furnished Property GFP (2)Government-furnished part GMSK Gaussian Minimum Shift Keying GG Transmission is in German GHFS Global High Frequency System (US Air Force) GHz GigaHertz GI (1)Government Issue GI (2)Old slang, from above: U.S. soldier GID Group Identification GIF Graphics Interchange Format, first used on CompuServe GIGO Garbage In, Garbage Out; first rule of computing GIMP GNU Image Manipulation Program, a nested acronym GIS Geographical Information System GKS Graphical Kernel System GLOB Ground Loving Old B-----d (KC-135) GLONASS Global Navigation Satellite System (Russian GPS) GM (1)CW brevity code: Good Morning GM (2)General Motors GM (3)General Manager GM (4)Guided Missile GMDSS Global Maritime Distress & Safety System GMF (1)Ground Mobile Force GMF (2)Government Master File (frequencies) GMI General Military Intelligence GMRS General Mobile Radio System GMS Geostationary Meteorological Satellite (Japanese) GMT (1)Greenwich Mean Time (obsolete, still UK's name for standard time) GMT (2)Ground Moving Target GMTI Ground Moving Target Indication GNA Gulf News Agency GNC (1)guidance and navigation computer GNC (2)guidance, navigation and control gnd ground GNDCON Ground Control gnu Gnu's Not Unix, a freeware op-system (recursive acronym) GO General Officer GOA Gone on Arrival (police) GOES (1)Geosynchronous Oceanic & Environmental Satellite GOES (2)Geostationary Operational Environmental Satellite GOGO government-owned, government-operated GOJ Government of Japan GORIZONT Moscow State University Geostationary Monitor satellite GOSIP Government Open Systems Interconnection Profile (UK & US) GOTS Government-off-the-shelf gov Government site (Internet) GOWON Gulf Offshore Weather Observing. Network gp Group GPM Gallon(s) per minute GPO (1)Government Printing Office (US) GPO (2)General Post Office GPR Ground Penetrating Radar GPRS General Packet Radio Service GPS Global Positioning System GR Hail (from French) GRADU Gradual weather change GRC General Radio Communications (AN/GRC-xxx) GRDCUS Gulf Range Drone Control Upgrade System grep Global Regular Expression, Print; Unix text search GRI Group Repetition Interval (Loran) grp Group GRT Gross register tonnage GS (1)General support GS (2)Group Separator (ASCII) GS (3)small hail and/or snow pellets GS (4)Ground Stop GS (5)Ground Station GSA General Services Administration (US) GSAC Ground support associate contractor GSC (1)Ground systems controller GSC (2)Ground support contractor GSCO Ground systems control officer GSD General support division GSE Ground support equipment GSF GPS support facility GSFC Goddard Space Flight Center, Greenbelt, MD GSM Global System for Mobile communications GSMP General Switch Management Protocol GSO Geostationary Satellite Orbit GSTS Ground-based surveillance and tracking system G-SWF Gradual Shortwave Fadeout (ionospheric disturbance) GTC Greek Telegraphy Club, aka SV-CW-C GTK GIMP Tool Kit, a deeply nested acronym gTLD generic top-level domain GTO (1)geosynchronous transfer orbit GTO (2)fast car made by Ferrari ("Gran Turisimo Omologato") GTO (3)not quite so fast car made by Pontiac GTOC Geosynchronous transfer orbit capability G-TOR Golay Transmissions Over Radio (Kantronics version of PACTOR) GTS Global Telecommunication System (WMO) GUI Graphical User Interface GUID Globally Unique Identifier GVAR GOES Variable GW (1)Gigawatt GW (2)CW brevity code: Good Evening GW (2)Ground wire GWARC General World Administrative Radio Conference GWEN Ground wave emergency network (VLF strategic net) GWT Gross Weight Tonnage H (1)Henry (unit of inductance) H (2)Magnetic field h/w Hardware H24 All 24 hours; station operates continuously HA ("Hotel Alpha") human remains HAARP HF Active Auroral Research Program HAAT Height Above Average Terrain HAC (1)higher authority communications(USAF) HAC (2)heading alignment circle (NASA) HAC (3)Hughes Aircraft Company HAES High Altitude ELINT System HAF Headquarters Air Force HAL (1)High-order Assembly Language (space shuttle computers); named for: HAL (2)Heuristically programmed Algorithmic Computer (2001: A Space Odyssey) HAMP Horizontal Avionics Modernization Planning HAMS Hilltop Amateur Mastertie System; old, big SoCal 440 MHz system HAR Highway Advisory Radio HARCO Harris Radio Company, makes HF setups HARM High-Speed Anti-Radiation Missile HAS Hardened Aircraft Shelter HASA High Altitude SIGINT Architecture HBD (1)Has Been Drinking (police) HBD (2)Hot Box Detector (railroad) HBI Horizontal Blanking Interval (TV) HBO Home Box Office (TV network) HBS Heart Beat Signal (Australian Internet) HBT Heterojunction Bipolar Transistor HBT Heterojunction Bipolar Transistor HC-ARQ Hagelin-Cryptos simplex teleprinter system HCI Human-Computer Interface HCJB Heralding Christ Jesus' Blessing (callsign) HCP Health and comfort package HD (1)Hard Disk HD (2)High Density HDB High-Density Bipolar HDD (1)Hard Disk Drive HDD (2)Heads Down Displays HDLC High-level Data Link Control, old synchronous computer protocol HDOP Horizontal Dilution of Precision (DGPS) HDR High Data Rate HDS Hard Disk Subsystem HDSL High-rate Digital Subscriber Line HDTV High-Definition Television HDX Half-duplex HE (1)high energy HE (2)high explosive HEAR Hospital Emergency Alert Radio (SoCal) HEMP High-altitude electromagnetic pulse HEMT High-electron-mobility transfer HEMTT Heavy expanded mobility tactical truck HEO (1)high earth orbit HEO (2)highly elliptical orbit HEP Head End Power (railroad locomotives) HERE Hazards of Electromagnetic Radiation to Equipment HERF High-Energy RF (weapons) Hertz Unit of frequency, named for Heinrich Hertz, 1Hz=1 cps HES Hurricane Evacuation Study HETS (1)heavy equipment transporter system HETS (2)heterodynes [~] Hex Hexadecimal number notation, base 16 HF High Frequency (3-30 MHz) HFBC High-Frequency broadcasting HFCC High-Frequency Coordination Conference HFDL High-Frequency Data Link, single-tone digital aero mode HFDLP HF Data Link Protocol HFDR HF Data Radio HFDU HF Data Unit HFGCS High Frequency Global Communication System (Scope Command) HFIA HF Industry Association HFMOD Australian Defence Force High Frequency Modernisation Project HFNC HF Network Controller HFNPDU HFDL: High Frequency Network Protocol Data Unit HFO (1)High-Frequency Oscillator HFO (2)Honolulu Forecast Office HFS Hierarchical File System HFSWR High-Frequency Surface-Wave Radar HHS (Dept. of) Health & Human Services HHT (1)Hand-Held Terminal HHT (2)Hand-Held Tester HI CW brevity code: a laugh (all dits, easier to send than "HA") HICOM High Command net (US Navy) HIDAR High Data Rate HIFER High-Frequency Experimental Radio (low-power ~13.5 MHz) Hi-fi High Fidelity (audio) HIPAS High-Power Auroral Stimulation HIPPI High Performance Parallel Interface HIRF High Intensity Radiation Fields HISCAT High-latitude, High-altitude, High-power, High-frequency, High-performance, Heating and ionospheric Scatter facility (research) HITRON Helicopter Interdiction Tactical Squadron (US Coast Guard) HIWAS Hazardous Inflight Weather Advisory Service HJ ("Hotel Juliet") Hijack HK Handle Key (Windows registry) HKCC Handle Key, Current Configuration (Windows registry) HKCR Handle Key, Classes, Root (Windows registry) HKCU Handle Key, Current User (Windows registry) HKDD Handle Key, Dynamic Data (Windows registry) HKEY Handle to a KEY (Windows Registry) HKG Hong Kong (old country code) HKLM Handle Key, Local Machine (Windows registry) HKTI Hong Kong Telecom International HKU Handle Key, Users (Windows Registry) HM Her Majesty HMCS Her Majesty's Canadian Ship HMMWV High mobility, multipurpose wheeled vehicle (hummvee) HMS Her Majesty's Ship HND Honduras (country code) HNG Hungary (country code) HNG-FEC Hungarian diplo FEC teleprinting system HNMP HF Network Management Protocol HNS Host nation support HOLF Helicopter Outlying Landing Field HP (1)High Pass (filter circuit) HP (2)Highway Patrol hp Horsepower Hpa Hectopascal HPC Hydrometeorological Prediction Center, MD HPE CW brevity code: "Hope to..." HPG Hardcopy Processor Group HPI High-Priority Intercept (global HF comint system) HPM High Power Microwave HPTS High-Power Transmitting System (TACAMO) HQ Headquarters HQAN HAVE QUICK A-Net HQDA Headquarters, Department of the Army HR High Resolution hr Hour HR Hybrid Receive HRC Harmonically Related Carrier (CATV channel scheme) HRCS High Resolution Camera System HRMP HF Relay Management Protocol HRPT High Resolution Picture Transmissions HRR High Resolution Radar hrs Hours HRT Hostage Rescue Team (FBI) HRT Hrvatske Radio Televizije (Croatian) HRV Croatia (country code) HSAL High Speed Algebraic Logic HSFB High Speed Fleet Broadcast HSI Hyperspectral Imaging HSIP H Camera Sensor Improvement Program HSSP HF Station Status Protocol HST (1)Hawaiian Standard Time HST (2)Hubble Space Telescope HT (1)Handie-talkie, a hand-held radio HT (2)Horizontal Tab (ASCII) HTI (1)Haiti (country code) HTI (2)Hostile Target Identification HTML Hypertext Markup Language (world wide web) HTS High Temperature Superconducting HTTP HyperText Transmission Protocol (WWW) HTTPD HTTP Daemon (Unix) HTTP-NG HTTP Next Generation HTTPS (1)HTTP Server HTTPS (2)HTTP with Secure Sockets Layer HUD Heads-up Displays HULTEC Hull to Emitter Correlation HUMINT Human Intelligence (spies!) HVAR High-Velocity Aerial Rocket HW CW brevity code: "How do you copy me?" hx Signal is a harmonic HYDROLANT US warnings for Atlantic and east HYDROMET Hydro-Meterological bulletin or warning HYDROPAC US warnings for Pacific Ocean and west Hyperfix Hyperbolic Radio Navigation System (proprietary name) HZ haze Hz Hertz (a "cycle per second") I (1)Current (in amperes, amps) I (2)Packet designator: information frame I (3)Italy (country code) I/O Input/Output (computers) i18n Alphabet scheme for multi-lingual computer programs [~] IA (1)Information Assurance IA (2)Italian Army IA (3)Short for IATSE, the movie/theatrical production union IA (4)Information Attack IAAFA Inter-American Air Forces Academy IAB Internet Architecture Board IAC International Analysis Code (weather codes FM-45, FM-46) IADS Integrated Air Defense System IAEM International Association of Emergency Managers (was NCEM) IAF Italian or Irish air force IAG Imagery Analysis Group IAGA International Association of Geomagnetism and Aeronomy IAIP Information Analysis and Infrastructure Protection IANA Internet Assigned Numbers Authority IAPS I Am Pretty Sure IARN International Amateur Radio Network IARP International Amateur Radio Permit (to operate overseas) IARU International Amateur Radio Union IAS (1)Image Access Service IAS (2)Indicated Air Speed IAS Intelligence Analysis System IATA International Air Transport Association IAU International Astronomical Union IAVTR Integrated Audio Visual Transmitter/ Receiver IAW In accordance with IBC (1)International Broadcast Center (Olympics) IBC (2)Italian Broadcasting Corporation IBCT Initial Brigade Combat Teams IBDL Inter Battery Data Link IBM (1)International Business Machines (company) IBM (2)de facto PC standard, though few are true blue IBOC In-band, on-channel (digital broadcasting) IC (1)Integrated circuit (chip) IC (2)Incident Command IC (3)Ice crystals IC (4)In-cloud lightning ICAO International Civil Aviation Organization ICAP Internet Calendar Access Protocol ICAS Intermittent Commercial and Amateur service (rating) ICBM Intercontinental Ballistic Missile ICD Interface Control Document ICE (1)Immigration and Customs Enforcement ICE (2)Intrusion Countermeasures Electronics ICM Intelligence Correlation Module ICMP Internet Control Message Protocol ICNIA Integrated Communications Navigation IFF Avionics ICNIS Integrated Communication Navigation and ID System ICOM (1) Intercom ICOM (2) Japanese radio mfr [~] ICOM (3) Integrated COMSEC ICON Image Communication and Operations Node ICP Internet Cache Protocol ICPO International Criminal Police Organization, see INTERPOL ICQ "I Seek You" (Internet message program) [~] ICRC International Committee of the Red Cross ICS Incident Command System ICSTIS Independent Committee for the Supervision of Standards of Telephone Information Services (UK) ICW interrupted continuous wave ID (1)Identification ID (2)Inside Diameter IDAS Integrated Air Defense System IDASS Integrated Data Analysis System for Spacecraft IDCP ID Data Combining Process IDE (1)Intelligent Drive Electronics (small HD standard) IDE (2)Integrated Developer Environment IDECM Integrated Defensive ECM I-DGS Interim-Deployable Ground Station IDLM Interference Detection, Locating, and Mitigation IDM Improved Data Modem IDN Internationalized Domain Names IDPS Interim Digital Processing System IDSL ISDN Digital Subscriber Line IEC International Electrotechnical Commission IED (1)Improvised Explosive Device IED (2)Imitative electronics deception IEE (1)Institute of Electrical Engineers (US), merged with IRE IEE (2)Institution of Electrical Engineers (UK) IEEE Institute of Electrical & Electronics Engineers IETF Internet Engineering Task Force IF Intermediate Frequency (of a receiver) IFE Inflight emergency IFF (1)Identification, Friend or Foe IFF (2)Logic operation: "if and only if" IFIM International Flight Information Manual IFK Incremental Frequency Keying IFL International Frequency List, ITU doc on fiche or 2 CDs IFOR Implementation Force ("UN peacekeepers") IFP Image Formation Processor IFPS Interactive Forecast Preparation System IFR (1)Instrument Flight Rules IFR (2)"I Follow Roads" IFRB International Frequency Registration Board IFRC Int'l Federation of Red Cross/Red Crescent IFSAR Interferometric Synthetic Aperture Radar IGBT Insulated Gate Bipolor Transistor IGDL Interoperable Ground Data Link IGMP Internet Group Management Protocol IGMP Internet Group Management Protocol IGP Interior Gateway Protocols IGRP Interior Gateway Routing Protocol IGY International Geophysical Year, big 50's research interval IHFR Improved high frequency radio IHO International Hydrographic Organization IHS Internal Hostile Structured threat IHU Internal Hostile Unstructured threat IL Intermediate Language (Object-oriented computing) ILC Integral Locomotive Computer (railroad) ILS Instrument Landing System IM (1)Intermodulation, causes spurious signals or distortion IM (2)Integrity Monitor (DGPS) IMA Individual Mobilization Augmentee (FEMA) IMAP Internet Message Access Protocol IMC Internet Mail Consortium IMD Intermodulation Distortion IMETS Integrated Meteorological System IMHO In My Humble Opinion (Internet) IMI CW prosign: interrogative; more often written "?" IMINT Imagery Intelligence IMIS Integrated Maintenance Information System IMM Image Manifest Message IMN Iraqi Media Network IMO (1)International Maritime Organization, part of UN IMO (2)In My Opinion (Internet) IMS Integrated Maritime Surveillance IMSA International Municipal Signal Association IMSP Internet Message Support Protocol IMTS Improved Mobile Telephone System IN (1)Intelligent Network IN (2)Indian Navy IN (3)Intelligence in inch INA Iraqi News Agency IND India (country code) indiv individual(s) INEFC Interagency National Emergency Fire Cache INFOSEC Information systems security ING International Notification Group(of IRAC) inHg inch of Mercury (air pressure) INMARSAT Intl. Maritime Satellite Org, a consortium, leases bandwidth on Marecs, Intelsat, Marisat for ship use. INMARSAT-A Inmarsat mobile voice/data terminal INMARSAT-B Improved version, replaced A INMARSAT-C Data-only INMARSAT terminal, also for SAFETYnet INMARSAT-E INMARSAT EPIRB INMARSAT-M INMARSAT terminal, voice only, not GMDSS-compliant INO Indian Ocean (MWARA) InP Indium Phosphide INS (1)Immigration & Naturalization Service (US, now part of ICE) INS (2)Inertial Navigation System INS (3)Indonesia (country code) INS (4)Internal Non-Hostile Structured threat INSCOM US Army Intelligence and Security Command INT (1)Interrogative (precedes a question) INT (2)International INT (3)Interrupted (transmission) INT (4)Interrupt (computer processing) intel Intelligence INTELCAST Intelligence Broadcast INTELNET Intelligence Network Internet Global interconnection of regional nets using TCP/IP InterNIC Internet Network Information Center INTERPOL International Criminal Police Organization Intl International, internal INU Internal Non-Hostile Unstructured threat IOC Index of co-operation (a fax parameter) IOD Issue Of Data (DGPS) IOM Installation, operation and maintenance IONCAP IONospheric Communications Analysis and Prediction, original prediction algorithm, still used IOR Indian Ocean Region IOS Indian Ocean Station (NASA) IP Internet Protocol IPA Intermediate power amplifier IPB Intelligence Preparation of the Battlefield IPCP Internet Protocol Control Protocol IPF Intelligence Processing Facility IPI Intelligent Peripheral Interface IPIR Initial Photo Interpretation Report IPIX Interface Processor for Imagery Exchange IPL Image Product Library IPng IP next generation IPS (1)Inches per second IPS (2)Ionospheric Prediction Service (Australia, original name for space weather agcy) IPSec Internet Protocol Security IPSS International Packet SwitchStream, now GNS (UK) IPT Integrated Program Team IPX Internetwork Packet Exchange (Novell) IQ In-phase/Quadrature (analyzer plot) IQSY International Year of the Quiet Sun, 1960's research interval IR (1) Infrared IR (2) Instrument route (numbered military training route) IRA International Reference Alphabet IRAC Interdepartment Radio Advisory Committee (part of US NTIA) IRBM Intermediate Range Ballistic Missile IRC (1)International Reply Coupon IRC (2)Internet Relay Chat, world's primo time waster IRC (3)International Red Cross IRC (4)Incrementally Related Carrier (CATV channel scheme) IRC (5)International Record Carrier IRCA International Radio Club of America IRCCM Infrared Counter-Countermeasures IRCM Infrared Countermeasures IRE Institute of Radio Engineers, now IEEE IRI Ionospheric Research Instrument, transmitter part of HAARP IRINT Infrared intelligence IRIS Improved Radio Ionospheric Sounder IRL Ireland (country code) IRN Iran (country code) IRQ (1)Interrupt request (computer hardware) IRQ (2)Iraq (country code) IRRM Image Recording Request Message IRRS Italian Radio Relay Service IRS (1)Information Receiving Station (SITOR) IRS (2)Internal Revenue Service (US) IRS (3)Infernal Revenue Service (U$) IRSS Infrared Surveillance System IRST Infrared Search and Track IS (1)Interval signal IS (2)Intermediate Standard, formerly RS IS (3)Information System IS-136 ANSI-136 multiple access standard ISA (1)Industry Standard Architecture (PC-AT bus) ISA (2)In-Session Activation (telco) ISABPS Integrated Submarine Automated Broadcast Processor System ISAM Indexed Sequential Access Method ISARC Intelligence, Surveillance, and Reconnaissance Cell ISB (1)Independent Sideband ISB (2)Intermediate Staging Base ISC Initial Scope Command (phase I) ISD Inverted Scanning Direction (radiofax) ISDL ISDN Digital Subscriber Line ISDN Integrated services & data network (telco) ISEC Information Systems Engineering Command ISF International Science Foundation ISI Inter-Symbol Interference ISM Industrial, Scientific, Medical (RF devices) ISMLS Interim Standard Microwave Landing System ISO (1)International Organisation for Standardisation ISO (2)International Organizations for Standardization ISODE ISO Development Environment ISP Internet service provider ISR In-System Reprogrammable ISS (1)Information Sending Station (SITOR) ISS (2)International Space Station ISSO (1)Information System Security Officer ISSO (2)Information Systems Security Organization (US) ISTR I Seem To Recall IT (1)Information Technology IT (2)Information Technology Directorate (FEMA) ITA International Telegraph Alphabet ITA1 International Telegraph Alphabet #1 (Old cablegrams, obsolete) ITA2 International Telegraph Alphabet #2 (Baudot double-shift) ITA3 International Telegraph Alphabet #3 (7-bit ARQ) ITA4 International Telegraph Alphabet #4 (FM VFT) ITER Improved Triple Ejector Rack ITFS Instructional Television Fixed Service ITO Installation transportation office ITS (1)Institute for Telecommunication Sciences ITS (2)Intelligent Transportation Systems ITU International Telecommunications Union ITU-R M.493-6 - Protocol for maritime Digital Selective Calling ITU-R ITU Sector for Radiocommunications, old CCIR ITU-T International Telecommunications Union - Telecommunication Standardization Sector ITU-T ITU Sector for Telecommunications, old CCITT ITU-TSS ITU Telecommunications Standards Section, old CCITT ITWS Integrated Terminal Weather System IUGG International Union of Geodesy and Geophysics IUSS Integrated Undersea Surveillance System IUWDS International Ursigram and World Days Service IVAS Inward Voice Activated Services (telco) IVCS Integrated Voice Communication Systems IVTT Integrated VERDIN Transmit Terminal IW Information Warfare IWS Information Warfare Squadron IWTS Integrated Terminal Weather System IXS Information Exchange System j Vector J/S Jamming to signal ratio J2 Intelligence directorate at a joint headquarters J2B Single sideband, suppressed carrier tone teleprinting (emission) J3E Single sideband, suppressed carrier AM radiotelephony (emission) J4 Logistics directorate at a joint headquarters JAA Joint Aviation Authorities (Europe) JAFO Just Another F[ine] Observer JAG Judge Advocate General JALBTCX Joint Airborne Lidar Bathymetry Technical Center of Expertise JAN Joint Army/Navy (spec) JANA Jamahiriyah News Agency JANET Joint Academic NETwork (UK) JAR Joint Aviation Requirements (Europe) JASORS Joint Advanced Special Operations Radio System JATACS Joint Advanced Tactical Command and Control System JATCC Joint Air Traffic Control Center JAWS Juneau Airport Wind System JAWSAT Joint Air Force-Weber State University Satellite JCS Joint Chiefs of Staff JCSE Joint Communications Support Element JDF Japanese Defense Force JDISS Joint Deployable Intelligence Support System JEDEC Joint Electronic Device Engineering Council Jeep Believed from "General Purpose" military vehicle, now a tradename JFC Joint force commander JFET Junction Field-Effect Transistor JIATF-E Joint Interagency Task Force, East (incorporates JTF-4) JIATF-S Joint Interagency Task Force, South (inc. JTF-6) JIATF-W Joint Interagency Task Force, West (inc. JTF-5) JIC Joint Information Center JINTACCS Joint Interoperability of Tactical Command and Control Systems JIT Just In Time (JAVA Compiler, proprietary to Sun) JITC Joint Interoperability Test Command (US) JIVE Jamming and Interception Vulnerability Estimator JJ (1)Joprep Jiffy (obsolete SAC weather report form) JJ (2)Transmission is in Japanese JJY Japanese standard frequency & time station [~] JMC (1)Joint movement center JMC (2)Jamaica (country code) JMPA Joint Military Postal Agency JMRO Joint medical regulating office JN Japanese Navy JOPES Joint Operations Planning and Execution System JOPREP Joint Operations Report JORN Jindalee Operational Radar Network (Australian OTH-B) JORN Jindalee OTH Radar Network JOSAC Joint Operational Support Airlift Center JOTS Joint Interoperability Targeting System JOVIAL Jules' Own Version of the International Algebraic Language, once used by USAF JP (1)Joint publication JP (2)Jumper (connection) JP4 Jet Propulsion #4 (military jet fuel) JPATS Joint Primary Aircraft Training System JPEG Joint Photographic Experts Group (lossy compression for pictures) JPL Jet Propulsion Laboratory, CA (NASA) JPNIC Japanese Network Information Center JRCC Joint Rescue Coordination Center JRTC Joint Readiness Training Center (Ft. Polk, LA) JSC Johnson Space Center, TX JSC Joint Spectrum Center JSF Joint Strike Fighter JSMSw Joint Spectrum Management Spectrum for Windows (software) JSORS Joint Advanced Special OPS Radio System JSTARS Joint Surveillance Target Attack Radar System, aka "Joint STARS," E-8 surveillance aircraft JTF Joint Task Force, usually US "War on Drugs" JTF-4 Caribbean drug interdiction unit, out of Key West, part of JIATF-E JTF-5 Pacific coast drug unit, part of JIATF-W JTF-6 South & Central America drug unit, part of JIATF-South JTFEX Joint Task Force Exercise JTIDS Joint Tactical Information Distribution System JTRS Joint Tactical Radio System JU JTIDS Unit (net member, like a "PU" in Link-11) JUH-MTF Joint user handbook for message text format JWICS Joint Worldwide Intelligence Communications System K Index Logarithmic, 3-hourly geomagnetic activity reading K (1)1024 (decimal) of anything (loosely from hexadecimal) K (2)CW prosign: "Go Ahead," technically an "Invitation To Transmit" k A thousand of anything, in decimal (short for kilo) k/c Kilocycles K/cs Kilocycles per second = kiloHertz KA9Q Packet radio protocol, from callsign of its inventor [~] KAM Kantronics All-Mode (packet/digital controller) KAWN Identifier attached to AWN weather products, as relayed by several HF stations KB Keyboard kB Kilobit, kilobaud kb/s kilobits per second KBD Keyboard kBd Kilobaud Kbps Kilobits per second KBS Korea Broadcasting System kc Kilocycles per second, now kHertz KCAS Knots Calibrated Air Speed KCNA Korean Central News Agency kcs Kilocycles per second, now kHertz KDU Keypad-Display Unit KGB Komitet Gossudarstwennoy Besopasnostij (transliterated from Russian by Klingenfuss), old USSR comint, replaced by FAPSI KH Keyhole, optical recon satellite, KH-12 resembles Hubble kHz KiloHertz KIPM Illuminati Primum Materium (Pirate) KISS Keep it simple, stupid (packet radio mode/engineering golden rule) km kilometer kMc kilo-Megacycle, now GigaHertz knot Nautical mile/hour [~] KNRM Koninklijke Nederlandse Redding Maatschappij (Dutch SAR org.) KOR (South) Korea (country code) Kp Planetary K index kph kilometer per hour KRE (North) Korea (country code) KSC Kennedy Space Center, Cape Canaveral, FL KSCPAO Kennedy Space Center Public Affairs Office (NASA) ksh Korn shell (Unix) KSR Keyboard Send-Receive kt knot (nautical mile per hour) KT knots KTS knots Ku-band 12-18 GHz microwave band kV Kilovolt KVA KiloVolt-Amp(s); can <> kW in highly reactive circuit kW Kilowatt L Inductance (in Henrys) L left (with reference to runway designation) L2TP Layer 2 Tunneling Protocol LA Low altitude Ladar Laser Radar LAHSO Landing And Hold Short Operations LAN Local Area Network LANL Los Alamos (NM) National Laboratory LANTAREA USCG Atlantic Area LANTIRN Low Altitude Navigation and Targeting Infra Red for Night LAO Laos (country code) LAPD (1)Link Access Procedure D-Channel LAPD (2)Los Angeles Police Department LAPM Link access protocol for modems LASER Light Amplification by Stimulated Emission of Radiation LAST last observation before a break in coverage at a manual station LAU Launcher Adapter Unit LBA Logical Block Addressing (Disk access) LBAR Limited area BARotropic (NCEP weather model) LBN Lebanon (country code) LBR Liberia (country code) LBY Lybia (country code) LC Limited Coastal (service) LCA St. Lucia (country code) LCAC Landing Craft, Air-Cushioned (large hovercraft) LCC Launch Control Center LCD Liquid Crystal Display LCMP Atlantic Composite Broadcast LCP Link Control Protocol (PPP) LCS Limited Coastal Station LCU Landing Craft, Utility (US Army) LDAP Lightweight Directory Access Protocol LDF Lightweight digital facsimile LDOC Long Distance Operational Control (civil aviation) LDP Landing Decision Point LDR (1)Low Data Rate LDR (2)Loader LDTWA Long Dual Trailing Wire Antenna (TACAMO) LEARN Law Enforcement Amateur Radio Network LEASAT Leased Satellite (US military comm) LED Light Emitting Diode LEO Low Earth Orbit ("Little LEO" = a data satellite) LES Land Earth Station LF (1)Low Frequency (30-300 kHz) LF (2)Linefeed LFO Low frequency oscillator LG Logistics Group LGTR Laser Guided Training Round LHCP Left-hand circular polarization LIAR Liar Imitates Apply Recursively (recursive) Lidar Light Detection & Ranging (light "radar") LIE Liechtenstein (country code) LIM (1)Lotus/Intel/Microsoft, original spec for PC extended memory LIM (2)Line interface module LINCOMPREX Link Compression and Expansion, an ACSB system Linux "Linus' Unix," open source shareware version of Unix LIRL Low Intensity Runway Lights LL Landline, "Lima Lima" LLC (1)Logical Link Control LLC (2)Limited Liability Corporation (US) LLCC Low Level Cloud Center (wx obs) LLNL Lawrence Livermore National Laboratory LLP Limited Liability Partnership (US) LLWAS Low Level Wind Shear Alert System LMAO Laughing My A-- Off (Internet) LMCC Land Mobile Communications Council LNB Low Noise amplifier/Block downconverter LNBF Low Noise amplifier/Block downconverter Feedhorn ln Natural logarithm LNP Local Number Portability (cell phones) LO Local oscillator (of a receiver) LOC (1)lines of communication LOC (2)location log Common logarithm LOGCAP Logistics Civil Augmentation Program LOGPAC Logistics package LOI Low Opportunity of Intercept LOJACK Vehicle locator beacon activated & DF'd by police LOL Laughing Out Loud (internet) LORAC Long Range Accuracy (NASA booster recovery) LORAN Long Range Navigation LORAN-A Discontinued 160m Loran system LORAN-C 100 kHz Loran system LORAN-D Military Loran system LOS (1)Loss Of Signal LOS (2)Line of sight LOTS logistics-over-the-shore LOWFER Low-Frequency Experimental Radio (~164-190 kHz) LP (1)Long Playing (old records) LP (2)Low pass (filter circuit) LP (3)Linking Protection (US mil ALE security) LP (4)Log Periodic (antenna) LPB Logistics preparation of the battlefield LPD Line Printer Daemon LPDA Log Periodic Dipole Array LPDU HDFL: Link Protocol Data Unit LPFM Low-Power FM (broadcasting) LPI Low Probability of Intercept LPM Lines per minute LPR Line Printer LPRS Low-Power Radio Service (FCC) LPT Logistics preparation of the theater LPTV Low-Power TV (broadcasting) LPVA Log Periodic V Array LQA Link Quality Analysis (databursts heard from ALE radios) LR Last Received (message) LRA Landing Rights Airport LRC (1)Longitudinal Redundancy Check (computing) LRC (2)Logistics and Readiness Center LRCOC Long Range Company Operational Control LS Last Sent (message) LSASS Local Security Authority Subsystem Service (Windoze) LSB (1)Lower Sideband LSB (2)Linux Standard Block LSB (3)Least Significant Bit/Byte LSDIS Light and Special Division Interim Sensor (US Army) LSE Logistics support element LSI (1)Large scale integration (of chips) LSI (2)Locomotive System Integration LST (1)Landing ship, tank LST (2)Local Standard Time LSV Logistic Support Vessel (US Army) LTG lightning LTR Letter(s) LTRS Letters case (Baudot lower case) LUF Lowest Usable Frequency (varies with path) LUT Local User Terminal LUU Parachute Flare LWR lower LZW Lempel-Ziv-Welch, lossless compression algorithm for data M (1)Mega, meg, a million of anything, or 1,048,576 bytes (hex) M (2)minus, less than M (3)Below zero C M (4)Statute Mile m Meter (39.37 inches) M/S (1)Motor Ship (also MS, M.S.) M/S (2)Mile per second m/s Meter per second M/V Motor Vessel (also m/v) m/v Motor Vessel (also MV) M1FC Model 1 Full Capacity (Air traffic control) mA milliamperes MAC (1)Military Airlift Command, now AMC MAC (2)Medium Access Control (computer networks) Mac Macintosh (computer) MACOM Major command MacTCP TCP/IP package for Macintosh MAFFS Modular Airborne Fire Fighting System (tank for C-130) MAFOR Maritime weather forecast MAGIS Marine Air-Ground Intelligence System mAh miliamp-hour(s) MAIT Major Accident Investigation Team (CHP) MAN Metropolitan Area Network, halfway between a LAN and a WAN MANPAD Man-Portable Air Defense MAP Maghreb Arabe Presse MAPI Mail/Messaging Applications Programming Interface MAPS Mail Abuse Prevention System (Internet) MARAD MARitime ADministration [~] MARC MAchine Readable Catalog MARCEMP Manual Relay Center Modernization Program (USN) MARO Maritime Air Radio Organization MARS (1)Military Affiliate Radio System (US) MARS (2)Maritime (mobile) Access & Retrieval System (ITU ship lookup) MARSA Military Assumes Responsibility for Separation of Aircraft MARSEC Marianas Sector (US Coast Guard) [~] MASER Microwave Amplification by Stimulated Emission of Radiation MASH mobile army surgical hospital, may be obsolete MASM Macro-Assembler (computer code) MATIC Mobility Assessment Test and Integration Center MATS Military Air Transportation Service, became MAC, now AMC MAU Media Attachment Unit, a network transceiver MAVICA Magnetic Video Camera MAYDAY Prosign: Distress traffic follows; repeated 3 times [~] MB Megabyte mb millibar MBCS (1)Multi Byte Character Set (Unicode) MBCS (2)Magnetic Bridge Current Sensor MBDL Missile Battery Data Link MBKS Multi-Button Key Set (telco) MBO Mailbox MBONE Multicast Backbone Mbps Megabytes per second MBR Master Boot Record ("boot sector") MCA Movement control agency MCC Master Control Center MCC Movement control center MCFB Multi-Channel Fleet Broadcast MCM Mine Countermeasures MCP (1)Mobile communications package MCP (2)Multimode Communications Processor (packet) MCP (3)Male chauvinist pig MCS Mission Communications System MCS/P Maneuver Control System/Phoenix (US Army) MCVFT Multichannel Voice Frequency Telegraph (multiplex RTTY) MDR Medium Data Rate MDS Multipoint Distribution Service MDT (1)Mobile Data Terminal (usually police) MDT (2)Mountain Daylight Time, US zone includes Rockies med medical MEDAFS Mine Warfare Environmental Data Analysis and Fusion System MEDCOM Medical command MEDFER Medium-frequency Experimental Radio (low power ~510-1710 kHz) MEDICAL Voice prosign attached to c/s of vessel with emergency medical supplies or patients, pronounced MAY-DEE-CAL MEDICO Emergency Medical Communications MEDLOG Medical logistics MEL Maximum Elevation (of a spacecraft) MEMA Massachusetts Emergency Management Agency MEOW (1)Maximum Envelope of Water MEOW (2)Maximum Envelope of Winds MER-# Mars Exploration Rover # (NASA) MERCAST MERchant ship broadCAST MEROD Message Entry and Read Out Device (Thales-Racal, see RAC-ARQ) MERS Mobile Emergency Response Support (FEMA) Messenger Mercury Surface, Space Environment, Geochemistry and Ranging Met Office Weather office at a base MET Meterological METAR Meteorological observation code for routine aviation METAREA Meteorological Area, same as a NAVAREA (see WMO) METARS Plural of METAR Meteo Meteorological METOC Meteorological and Oceanographic Centre (Halifax, NS) Metro Meteorological office METSAT Meterological Satellite MF (1)Medium Frequency (300-3000 kHz) MF (2)Multifrequency mf Microfarad MFA Ministry of Foreign Affairs MFD Modulated Fractional Division MFM Modified Frequency Modulation (Miller Coding) MFSK Multiple Frequency Shift Keying mgt management mH Millihenry MHD Magnetohydrodynamics; behavior of plasmas in magnetic fields, such as the ionosphere and sunspots MHE materials-handling equipment MHFCS Australian Modernised HF Communication System MHS Message Handling System MHz MegaHertz MI (1)Military intelligence MI (2)shallow mi mile (1.6 km) MI5 Directorate of Military Intelligence, group 5 (UK domestic) MI6 Directorate of Military Intelligence, group 6 (UK foreign, aka SIS) MIB Management Information Base MICR Magnetic Ink Character Recognition (as used by banks) MICS Medical Implant Communications Service MID (1)Middle East (MWARA) MID (2)Maritime Identification Digits, country code prepended to MMSI MIDI Music Industry Digital Interface MIDS Multifunctional Information Distribution System MIFG Shallow Fog MIJI Meaconing, Intrusion, Jamming & Interference ("Jammer writeup") Mil (1) Military Mil (2) Milliampere MIL-188-110A NATO standard for single-tone modems MIL-188-141A NATO standard for ALE controllers MIME Multipurpose Internet Mail Extensions, allows attachment of binaries to ASCII text letters MIMS Medical Information Management System min Minute MINIMUF Miniature Maximum Usable Frequency calculator, classic BASIC MUF prediction algorithm MINREX Ministerio de las Relaciones Exteriores (Cuban news agency) MIR Not an acronym; transliteration of Russian for "Peace" MIREX Mir Experiment, amateur robot packet station on Mir MIRL Medium Intensity Runway Lights MIS Management Information Systems MISDN Mobile ISDN MISR Multi-angle Imaging SpectroRadiometer (Terra satellite) MIT Massachussetts Institute of Technology M-JPEG JPEG used for moving pictures (cf JPEG, MPEG) mkr Marker ML Machine language, how computers store instructions MLB (1)Motor Lifeboat MLB (2)Magnetic Longwire Balun MLM Marine Location Marker MLS Microwave Landing System MLSE Maximum Likelihood Sequence Estimator MLSO Mauna Loa Solar Observatory MLT Magnetic Local Time MM Maritime mobile mm Millimeter MMC (1)materiel management center MMC (2)Microsoft Management Console mmf micro-microfarad, changed to picofarad MMS Maritime Mobile Service MMSI Maritime Mobile Service Identity (code for DSC) MMX Multimedia extensions (microprocessor architecture) MNCS Master Net Control Station MNP Modem Network Protocol MOA Military Operation Area MOAB Massive Ordnance, Air Blast Mob Mobile MOC (1)Mission Operation Center MOC (2)Ministry Of Commerce (Canada) MOC MERS Operations Center (FEMA nested acronym) MOCA Minimum Obstruction Clearance Altitude MoD Ministry of Defence (UK) MOD Mobile Offshore Drilling Mod Modification (to radio) Mode A SITOR-A (ARQ) Mode B SITOR-B (FEC) Modem Modulator/Demodulator MODIS Moderate Resolution Imaging Spectroradiometer (Terra satellite) MODU Mobile Offshore Drilling Update MOI Ministry Of Information MOOTW Military operations other than war MOP (1)Measure Of Performance MOP (2)Ministry Of Petroleum MOPP mission-oriented protection posture (0-4, 4 being full suit) MOS (1)Metallic Oxide Silicon MOS (2)Mitoudt Sound, shooting film with a silent camera MOSAIC Multifunctional On-the-move Secure Adaptive Integrated Communications MOSFET MOS Field Effect Transistor MOSS MIME Object Security Services MOTD Message Of The Day MOTIS Message Orientated Text Interchange Service, ISO version of MHS MOV moved/moving/movement MOX Manually Operated Switching MOZ (1)Mozambique (country code) MOZ (2)Mozilla (computer browser) MP (1)Military Police (US) MP (2)Member of Parliament (UK) MP (3)Multiprocessor (computer h/w) MP Magnetopause MP2 MPEG-1 Level 2, replaced by MP4 MP3 MPEG-1 Level 3, CD-quality compression scheme MP4 MPEG-1 Level 4, audio/video compressor MPDU HFDL: Media access Protocol Data Unit MPEG Motion Picture Expert Group, lossy compression for video MPG (1)File extension: MPEG video MPG (2)Miles Per Gallon mph mile per hour MPSA Military Postal Service Agency MPSAP Mobile Public Safery Answering Point MPX Multiplex MR Magnetoresistive MRB Marine Radio Beacon MRC (1)Mobile Radio Communications MRC (2)Morocco (country code) MRCC Maritime Rescue Coordination Center MRE Meal, Ready-to-Eat MRF Medium Range Forecast (NCEP) MRO medical regulating office MRS Mountain Radio Service MRSC Maritime Rescue Sub-Center MRS MPA Medium Range Surveillance Maritime Patrol Aircraft MRT (1)Mountain Rescue Team MRT (2)Mauretania MRU Most Recently Used MS Master Station ms millisecond mS millisiemen MS (1)Motor Ship MS (2)Meteor Scatter MS-188 MIL-STD-188, Military telecom standards MSB (1)Most Significant Bit/Byte MSB (2)Main Support Battalion MSC Military Seaflift Command (US) MSE (1)Mobile Subscriber Equipment MSE (2)Mean Square Error MSF (1)English standard frequency & time station MSF (2)Medicins Sans Frontiers (Doctors Without Borders) MSFC NASA Marshall Space Flight Center msg Message MSI (1)Maritime Safety Information MSI (2)Marine Safety Information MSIS Mass Spectrometer Incoherent Scatter (research) MSK Minimum Shift Keying MSR (1)main supply route MSR (2)Mobile Sea Range MSS Mobile Satellite Service MST (1)Mountain (US) Standard Time, zone includes Rockies MST (2)Maintenance support team MT (1)Monitoring Times (**the bible**) MT (2)mountain(s) MT (3)Mitigation Directorate (FEMA) MTA (1)Message Transfer Agent MTA (2)Metropolitan Transit Authority MTADS Multi-sensor Towed Array Detection System MTBF Mean Time Before Failure MTF medical treatment facility MTI Moving Target Indicator MTMC Military Traffic Management Command mtr Meter, either distance unit or measuring device MTTR Mean Time To Repair MTU Maximum Transmit Unit (TCP/IP packet length) MUF Maximum Usable Frequency (varies with path) MULTICS Multiplexed Information and Computing Service; Unix precursor Mung (1) Verb: to Mash Until No Good Mun