| Abbreviation | Definition |
|---|---|
| MDA | Milestone Decision Authority |
| MDA | Ministerio DeDefensa Aviation |
| MDA | Missile Defense Act |
| MDA | Missile Defense Agency |
| MDA | Multinational Deployment Agency |
| MDAGS | Missile Development Airborne Guidance System |
| MDAGS | Modular Digital Airborne Guidance Section |
| MDAP | Major Defense Acquisition Program |
| MDAP | Mutual Defense Assistance Program |
| M-DARC | Military Direct Access Radar Channel |
| MDARS | Mobile Detection Assessment and Response System |
| MDATE | Mobilization Date |
| M-DAY | (day Full Mobilization Is Declared) |
| M-Day | Mobilization Day |
| M-Day | Unnamed Day On Which Mobilization of Forces Begins |
| MDB | Multilateral Development Bank |
| MDBIC | Missile Defense Battle Integration Center |
| MDC | Maintenance Data Collection |
| MDC | McDonnell Douglas Corporation |
| MDC | Mega Damage Counters |