| Abbreviation | Definition |
|---|---|
| MDC | Mobile Data Center |
| MDCC | Military Derivatives Completion Center |
| MDCI | Multidiscipline Counterintelligence |
| MDCN | Military Diplomatic Clearance |
| MDCN | Military Diplomatic Clearance Number |
| MDD | Maintenance Deferred Defect |
| MDD | Mine Detection Dog |
| MDDC | Missile Defense Data Center |
| MDDOC | Marine Air-Ground Task Force (MAGTF) Deployment and Distribution Operations Center |
| MDDS | Multi-Domain Dissemination System |
| MDE | Military Dynasty Elimination |
| MDEP | Management Decision Package |
| MDES | Military Domain Experts Scheme |
| MDF | Magical Defense Factor |
| MDF | Main Defense Forces (NATO) |
| MDF | Maritime Defence Force |
| MDG | Moisture Density Gauge |
| MDI | Modernized Demolition Initiator |
| MDI | Multipurpose Display Indicators |
| MDIS | Medical Diagnostic Imaging System |