| Abbreviation | Definition |
|---|---|
| FOA | Fellowship Of Assassins |
| FOA | Field Operating Agency |
| FOAB | Father of All Bombs |
| FOB | Fall Out Boy |
| FOB | Feet On Bunk |
| FOB | Field Of Battle |
| FOB | Forward Operating Base |
| FOB | Forward Operations Base |
| FOB | Fractional Orbital Bombardment |
| FOB | Fresh Off the Boat |
| FOBB | Flag Officer Billet Board |
| FOBIT | Forward Operating Base |
| FOBS | Fractional-Orbital Bombardment System |
| FOC | Fiber-Optic Cable |
| FOC | Fleet Operations Center |
| FOC | Flight Operations Center |
| FOC | FORSCOM (FORces COMmand) Operations Center |
| FOC | Full Operational Capability |
| FOC | Future Operations Cell |
| FOCC | Forward Observer Command and Control |