| Abbreviation | Definition |
|---|---|
| SMRI | Service Message Routing Indicator |
| SMRV | Small Multiple Reentry Vehicle |
| SMRV | Small Multiple Re-entry Vehicle |
| SMS | Seiner Majestat Schiff |
| SMs | Service members |
| SMS | Single Mobility System |
| SMS | Sleep Management System |
| SMS | Supply Management Software |
| SMSA | Salvage Mechanic Seaman Apprentice |
| SMSB | Strategic Missile Support Base |
| SMSC | System Maintenance and Support Center |
| SMSGT | Senior Master Sergeant |
| SMSN | Salvage Mechanic Seaman |
| SMSN | Sudbury Military Support Network |
| SMT | Station ManagemenT |
| SMTP | Simple Message Transfer Protocol |
| SMU | Special Mission Unit |
| SMU | Supported Activities Supply System (SASSY) Management Unit |
| SMU | Switch Multiplexer Unit |
| SMURF | Secret Military Underground Resistance Force |