| Abbreviation | Definition |
|---|---|
| FS | Flying Screen |
| FS | Force Support |
| FS | Fort Smith |
| FS | Friendly Status |
| FS | Full Scale |
| FS | Fuselage Station |
| FSA | Fire Support Area |
| FSA | Force Structure Allowance |
| FSA | Foreign Systems Acquisition |
| FSA | Free Syria Army |
| FSA | Free Syrian Army |
| FSA | Full Speed Ahead |
| FSAC | Fire Support Armament Center, Picatinny Arsenal, Dover, NJ |
| FSAF | French Surface-to-Air missile Family |
| FSAH | Free Syrian Army Help |
| FSAP | Family Support Assistance Program(s) |
| FSAP | Full Spectrum Active Protection |
| FSAR | Final Safety Analysis Report |
| FSAT | Full Scale Aerial Target |
| FSATS | Fire Support Automated Test System |