| Abbreviation | Definition |
|---|---|
| FAST-I | Forward Area SID & TRAP-Improved |
| FAT | Factory Acceptance Test |
| FAT | Fatalities |
| FAT | Final Acceptance Test |
| FAT | First Article Test |
| FAT | Flechette Anti Tank |
| FATACOPS | Field Artillery Tactical Operations |
| FATDS | Field Artillery Tactical Data System |
| FATE | Future Affordable Turbine Engine |
| FATSS | Forward Area Target Surveillance System |
| FAW | Forward Area Weapons |
| FAWPSS | Forward Area Water Point Supply System |
| FAX | Facsimile |
| FAZ | Forces Armées Zairoises |
| FAZ | Foreign Access Zone |
| FB | Fighting Biplane |
| FB | Firing Battery |
| FB | Flash Back |
| FB | Forward Boundary |
| FBA | Full Body Armor |