| Abbreviation | Definition |
|---|---|
| FCL | Final Coordination Line |
| FCLAS | Full Spectrum Active Protection Close-In Layered Shield |
| FCLIP | Fire Control Loop Improvement Program |
| FCM | Flashpoint Combat Mission |
| FCM | Foreign Consequence Management |
| FCMSgt | First Chief Master Sergeant |
| FCN | Field Change Notice |
| FCO | Facility Control Office |
| FCP | Facilities Construction Plan |
| FCP | Fire Control Party |
| FCP | Fire Control Plan |
| FCPL | Flight Corporal |
| FCR | Fire Control Radar |
| FCRC | Federal Contract Research Center |
| FCS | Fast Combat Strategy |
| FCS | Fieldbus Connection System |
| FCS | Fire Control System |
| FCS | Forward Control Section |
| FCS | Future Combat System |
| FCSA | Fire Controlman Seaman Apprentice |