| Abbreviation | Definition |
|---|---|
| S-1 | Army Adjutant/Personnel Staff at the Battalion/Brigade level |
| S-2 | Army Intelligence Staff at the Battalion/Brigade level |
| S-2 | Battalion or Brigade Intelligence Staff Officer (Army |
| S-2 | Marine Corps Battalion or Regiment) |
| S2E | Seamless Synthetic Environment |
| S-3 | Army Operations Staff at the Battalion/Brigade level |
| S-3 | Battalion or Brigade Operations Staff Officer (Army |
| S-3 | Marine Corps Battalion or Regiment) |
| S3I | Signatures, Sensors, and Signal Processing Integration |
| S3I | Signatures, Sensors, and Signal Procession Integration |
| S-4 | Army Logistics Staff at the Battalion/Brigade level |
| S-4 | Battalion or Brigade Logistics Staff Officer (Army |
| S-4 | Marine Corps Battalion or Regiment) |
| S-5 | Army Civilian Affairs/Public Affairs Staff at the Battalion/Brigade level |
| S-6 | Army Communications and Information Management Staff at the Battalion/Brigade Level |
| S-7 | Army Inter-Component Integration Staff at the Battalion/Brigade Level |
| S-8 | Army Resource Management Staff at the Battalion/Brigade Level |
| S-9 | Army Facilities Management Staff at the Battalion/Brigade Level |
| SA | Safety Assessment |
| SA | Seaman Apprentice |