| Abbreviation | Definition |
|---|---|
| STS | Self Test Software |
| STS | Sensor-To-Shooter |
| STS | Siege Tank Slashes |
| STS | Special Tactics Squadron |
| STS | Synochronous Transport Signal |
| STS | Synochronous Transport signals |
| STSC | Software Technology Support Center |
| STT | Situational Training Template |
| STT | Small Tactical Terminal |
| STT | Special Tactics Team |
| STT | Subcommittee on Telecommunications Security of NTISSC |
| STT | Subcommittee on Telecommunications Security of NTISSC (National Telecommunications and Information Systems Security Committee) |
| STT | System Technical Test |
| STU | Secure Telephone Unit |
| STUAS | Small Tactical Unmanned Aircraft System |
| STU-III | Secure Telephone Unit III |
| STUPID | Secure Transmitter Unit Platform Integration Directorate |
| STW | Shoot The Weasel |
| STW | Silent Titanium Warriors |
| STW | Strike Warfare |