| Abbreviation | Definition |
|---|---|
| FEAR | First Encounter Assault And Reconnaissance |
| FEB | Força Expedicionária Brasileira |
| FEBA | Forward Edge of the Battle Area |
| FEC | Far East Command |
| FEC | Forward Error Correction |
| FECC | Fires and Effects Coordination Cell |
| FED | Forward Entry Device |
| FEDB | Failure Experience Data Bank |
| FEDS | Flexible Engine Diagnostic System |
| FED-STD | Federal Standard |
| FEED | Front End Engineering Design |
| FEEMS | Facilities Engineering Equipment Maintenance System |
| FEI | Functionally Emulative Increment |
| FEK | Frequency Exchange Keying |
| FEL | Free Electron Laser |
| FEMA | Federal Emergency Management Agency |
| FEP | Fleet Satellite (FLTSAT) Extremely High Frequency (EHF) Package |
| FEP | Front End Processor |
| FEPP | Federal Excess Personal Property |
| FEPP | Foreign Excess Personal Property |