| Abbreviation | Definition |
|---|---|
| FOI | Fault Detection Isolation |
| FOI | FOrskningsInstitut (Swedish Defence Research Agency) |
| FOIA | Freedom Of Information Act |
| FOIU | Fiber Optic Interface Unit |
| FOL | Forward Operating Location |
| FOM | Federation Objective Model |
| FOM | Freedom Of Maneuver |
| FON | Fighters Of Norway |
| FON | Freedom of Navigation (Operations) |
| FONECON | Phone Conversation |
| FONR | Fort Ord Natural Reserve |
| FOO | Field Ordering Officer |
| FOO | Forward Observation Officer |
| FOR | Family of Operational Rations |
| FOR | Field Of Reduction |
| FOR | Field-Of-Regard |
| FORCE | Finally Organizing Really Cool Events |
| FORCEM | Force Evaluation Model |
| FORCM | Force Master Chief Petty Officer |
| FORCPAC2 | Force Projection Army Command and Control |