| Abbreviation | Definition |
|---|---|
| MCMO | Medical Civil Military Operations |
| MCMO | Medical Civil-Military Operations |
| MCMOPS | Mine Countermeasures Operations |
| MCMP | Marine Corps Master Plan |
| MCMREP | Mine Countermeasure Report |
| MCN | Media Change Notification |
| MCN | MSE Circuit Network |
| MCNR | Military Construction Naval Reserve |
| MCO | Major Combat Operation |
| MCO | Mapping Customer Operations |
| MCO | Marine Corps Order |
| MCO | Master Control Operator |
| MCO | Mission Control Officer |
| MCO | Movement Control Officer |
| MCOFT | Mobile Conduct Of Fire Trainer |
| MCOLF | Marine Corps Outlying Landing Field |
| MCOO | Modified Combined Obstacle Overlay |
| MCOP | Military Commission Observation Project |
| MCP | Maintenance Collection Point |
| MCP | Military Continuous Power |