| Abbreviation | Definition |
|---|---|
| MS | Modular System |
| MS | Moral Support |
| MS/DE | Mode Selection/ Deployment Estimation |
| MS1 | Mess Specialist First Class |
| MS2 | Mess Specialist Second Class |
| MS3 | Mess Specialist Third Class |
| MSA | Mobil Subscriber Access |
| MSA | Mobile Subscriber Access |
| MSA | Multi- Source Agreement |
| MSA | Multichannel Signal Analyzer |
| MSAA | Modelling Simulation And Analysis |
| MSAC | Medical Situational Awareness and Control |
| MSAM | Medium Surface-to-Air Missile |
| MSAMS | Mobile Surface-to-Air Missile System |
| MSAN | Military Spouse Advocacy Network |
| MSAT | Multi- Sensor Aided Targeting |
| MSB | Main Support Battalion |
| MSB | military spouse bloggers |
| MSB | Military Superannuation and Benefits |
| MSB | Most Significant Bit |