| Abbreviation | Definition |
|---|---|
| MSS | Marine Scout Snipers |
| MSS | Medical Surveillance System |
| MSS | Meteorological Satellite Subsystem |
| MSS | Military Salindais Ship |
| MSS | Military Sensing Symposia |
| MSS | Mine Sweeper Sea |
| MSS | Mission Support System |
| MSS | Multi-Spectral Scanner |
| MSSA | Mess Specialist Seaman Apprentice |
| MSSA | Military Style Semi Automatic |
| MSSA | Military-Style Semi-Automatic |
| MSSC | Military Student Success Center |
| MSSG | Marine Expeditionary Unit (MEU) Service Support Group |
| MSSG | Military Stabilisation Support Group |
| MSSI | Military Service for Security and Intelligence |
| MSSN | Mess Specialist Seaman |
| MSSN | Military Spouse Support Network |
| MSST | Military Survival Skills Training |
| MSSW | Mission Support Software |
| MST | Maintenance Support Team |