| Acronyms | Meaning / Significance |
Source |
| F&E | fonctionnement et entretien | O&M |
| F-Series | Telegraph and telematic services operations and traffic | ITU-T recommendations |
| FA | food and agriculture | |
| FA | functional area | |
| FAA | federal aviation agency | |
| FAA | forward administrative area | |
| FAAC | feature and attribute coding | ACE ACCIS core cap specs |
| FAC | forward air controller | |
| FAFCO | federal armed forces communication organisation | GE |
| FAFIC | federal armed forces intelligence centre | GE AHRWEILER |
| FAFICS | federal armed forces integrated communication system | GE NDN |
| FAFIO | federal armed forces intelligence office | ANBw |
| FAFISCO | federal armed forces information systems and communications office | AFmISBw |
| FAFTN | federal armed forces telecommunications network | BwGN |
| FAI | financial acceptance inspection | |
| FAM | facility assessment meeting | |
| FAMS | force assessment management support | |
| FANS | future air navigation system | ICAO |
| FAPC | food and agriculture planning committee | |
| FARP | forward arming and refueling point | |
| FAS | formal alert system | |
| FAS | functional area support | |
| FASC | forward air support centre | |
| FASS | functional area sub-system | |
| FASTNET | UK army fixed communication network | |
| FBIS | Foreign Broadcast Information Service | |
| FBS | fall back system | |
| FC | facilities control | |
| FC | financial controller | |
| FC | financial controller | |
| FC | fusion component | BICES |
| FCO | fire control officer | |
| FD | formal description | |
| FDDI | fibre distributed data interface | ACE ACCIS core cap specs |
| FDM | frequency division multipex | |
| FDMA | frequency division multiple access | APD 04.05.03 (95)04 |
| FDPS | flight data precessor system | |
| FDT | formal description technique | |
| FDV | Flugdatenverarbeitung | |
| FDX | full duplex | NACISA/APD/04.07.00(95)001 |
| FEATS | future European air traffic service system | |
| FEBA | forward edge of battle area | |
| FEC | forward error correction | STC CSNI final report 22/9/95 |
| FEMA | federal emergency management agency (US) | |
| FEP | front-end processor | |
| FETS | frais d'etude technique et de surveillance | |
| FG | force goal ( force planning objective / 6 years rolling plan) | |
| FGS | force goals | |
| FH | frequency hopping | |
| FHU | force helicopter unit | |
| FIPS | federal information processing standard | |
| FIR | flight information region | |
| FIS | flight information service | |
| FISA | file transfer in support of ACCS | |
| FLET | forward line of enemy troops | |
| FLOT | forward line of own troops | |
| FLTSAT | fleet satellite | STC CSNI final report 22/9/95 |
| FM | force management | |
| FM | frequency modulation | |
| FMIS | financial management system | |
| FMO | financial management office | |
| FMOPT | federal ministry of post and telegraph (GE) | |
| FMP | flow management position | |
| FMR | force mix ratio | |
| FMS | flight management system | |
| FMS | foreign military sales | |
| FNA | final network acceptance | |
| FNP | front-end network processor | |
| FO | fibre optic | |
| FO. | flag officer . 1st letter of country name | |
| FOB | forward operating base | |
| FOC | full operating capability | |
| FOC | full operational capability | |
| FOFA | follow-on force attack | |
| FOI | fibre optic interface | |
| FOIRL | fiber optic inter repeater link | |
| FOL | forward operating location | |
| FOPR | functional office of primary responsibility | |
| FORACS | fleet operational readiness acuracy check site | |
| FORMETS | NATO message text formatting system | |
| FOSIC | fleet OPS special intel centre | |
| FOT | frequency optimum traffic | |
| FOTS | fibre optic transmission system | |
| FOURCE | C3 and combat effectiveness | |
| FP | force proposal | AC/317-N/798 |
| FPAC | food and agriculture planning committee | |
| FPL | flight plan | |
| FPLMTS | future public land mobile telecommunications system | |
| FPPR | flight plans and procedural routing | |
| FPPS | flight plan processing system | |
| FRI | fundamental review of infrastructure | |
| FRUIT | friendly replies unsynchronized in time | |
| FRY | former republic of Yugoslavia | |
| FS | feasibility study | |
| FS | functional standard | |
| FSA | final site acceptance | |
| FSA | final system acceptance | |
| FSCL | fire support coordination line | |
| FSD | full scale development | |
| FSDTF | functional specification development task force | |
| FSED | full scale engineering development | |
| FSED | Full Scale Engineering Development | |
| FSGT | fixed satellite ground terminal | APD 04.05.03 (95)04 |
| FSP | forward support point | |
| FSS | field storage site | |
| FSS | fixed satellite service | AC/317-N/839 |
| FSS | forward scatter system | |
| FTAM | file transfer access (and) management | |
| FTAM | file transfer and access management | |
| FTAM | File Transfer and Access Method | |
| FTAM | file transfer and management | |
| FTE | field training exercise | |
| FTI | fixed target indicator | |
| FTP | file transfer protocol | ACE ACCIS core cap specs |
| FTS | file transfer system | |
| FTX | field troop exercise | |
| FU | fire unit | Hawk, Patriot |
| FUI | flow control unnumbered information | |
| FYR | former Yugoslav republics | |
| FStS | AC/4-A(97)20 |