| Abbreviation | Definition |
|---|---|
| SSTR | Senior Staff Technical Representative |
| SSTR | Stability, Security, Transition, and Reconstruction |
| SSVC | Scotland School for Veterans' Children (est. 1895; Scotland, PA; Pennsylvania Department of Military and Veterans Affairs) |
| SSWG | System Safety Working Group |
| SS-X-17 | Sbuoe Missile |
| SS-X-24 | Scalpel Missile |
| ST | Satellite Transmitter |
| ST | Scientific/Technical |
| ST | Self Test |
| ST | Service Time |
| ST | Ship Type |
| ST | Short Ton |
| ST | Siege Tank |
| ST | Situation Time |
| ST | Small Tug |
| ST | Special Tactics |
| ST | Special Text |
| ST | Special Training |
| ST | Standby Time |
| ST | Support Technical |