| Abbreviation | Definition |
|---|---|
| MCG&I | Mapping Cartographic, Geospatial & Imaging |
| MCG&I | Mapping, Cartographic, Geospatial, and Imaging |
| MCGD | Millimeter Wave Contrast Guidance Demonstration |
| MCGP | Military Collector Group Post |
| MCH | Mission Critical Hardware |
| MCI | Marine Corps Institute |
| MCI | Military Customs Inspection |
| MCI | Multi-Casualty Incident |
| MCIA | Marine Corps Intelligence Activity |
| MCIC | Metals and Ceramics Information Center |
| MCICOM | Marine Corps Installation Command |
| MCIO | Military Criminal Investigative Organization |
| MCIOC | Marine Corps Information Operations Center |
| MCIP | Marine Corps Information Publication |
| MCIP | Military Command Inspection Program |
| MCIR | Military Council for Iraqi Revolutionaries |
| MCIT | Mobile Counter IED (Improvised Explosive Device) Trainer |
| MCJSB | Military Committee Joint Standardization Board |
| MCL | Materials Cutting List |
| MCL | Maximum Containment Level |