| Abbreviation | Definition |
|---|---|
| FORGEN | Force Generation (Report) |
| FORMAN | Force Management System |
| FORMDEPS | FORSCOM Mobilization and Deployment Planning System |
| FORN | Foreign National |
| FORN | Former Officers Reserve Navy |
| FORSCOM | U.S. Army Forces Command |
| FORSCOM | United States Army FORces COMmand |
| FORSTAT | Force Status and Identity Report |
| FORTAS | Forward Observation Remote Target Acquisition System |
| FOS | Forward Observer System |
| FOS | Forward Operating Site |
| FOS | Full Of Shit |
| FOS | Full Operational Status |
| FOSE | Federal Office Systems Exposition |
| FOSIC | Fleet Ocean Surveillance Information Center |
| FOSS | Field Operational Support System |
| FOT | Field Operational Test |
| FOT | Follow-on Operational Test |
| FOT | Fresh Off of the Truck |
| FOT&E | Follow-on Operational Test and Evaluation |