| Abbreviation | Definition |
|---|---|
| FSG | Federal Supply Group |
| FSGT | Flight Sergeant |
| FSH | Full Service History |
| FSHTU | Fire Support Hand-held Terminal Unit(LCU) |
| FSIC | Forward Sensor Interface and Control |
| FSK | Frequency Shift Key |
| FSK | Frequency Shift Keying |
| FSM | Fort Smith, Arkansas Army Base |
| FSM | Fort Smith, Arkansas Army Base |
| FSMAA | Fire Support Mission Area Analysis |
| FSMP | Forward Support Maintenance Point |
| FSN | Federal Stock Number |
| FSNMP | Fredericksburg and Spotsylvania National Military Park |
| FSO | Facility Security Officer |
| FSO | Fire Support Officer |
| FSO | Flight Safety Officer |
| FSO | Flotilla Staff Officer |
| FSO | Forward Support and Observer |
| FSOP | Field Standard Operating Procedures |
| FSP | Fire Support Planning |