| Abbreviation | Definition |
|---|---|
| MDSS | II Marine Air-Ground Task Force (MAGTF) Deployment Support System II |
| MDSS | Maintenance Decision Support System |
| MDSS | Mobilization Decision Support System |
| MDSU | Mobile Diving and Salvage Unit |
| MDT | Monthly Death Toll |
| MDT2 | Multiservice Distributed Training Testbed |
| MDW | Military District of Washington |
| MDWG | Maryland Wing |
| MDWG | Missile Defense Working Group |
| MDZ | Maritime Defense Zone |
| ME | Military Expenditure |
| ME | Mission Environment |
| ME/C | Medical Examiner and/or Coroner |
| MEA | Maintenance Engineering Analysis |
| MEA | Maintenance Entity Assembly |
| MEA | Munitions Effect Assessment |
| MEA | Munitions Effectiveness Assessment |
| MEACONING | Measuring and Confusing |
| MEADS | Medium Extended Air Defense System |
| MEAT | Multiple Edge Adaptive Tracker |