| Abbreviation | Definition |
|---|---|
| OMAR | Operation and Maintenance, Army Reserve |
| OMARNG | Operation and Maintenance, Army NG |
| OMARNG | Operations and Maintenance, ARmy National Guard |
| OMB | Office of Management and Budget |
| OMB | Operations Management Branch |
| OMB | Originating Message Buffer |
| OMC | Office of Military Cooperation |
| OMC | Operation and Maintenance Center |
| OMC | Optical Memory Card |
| OMCK | Office of Military Cooperation Kuwait |
| OMCR | Organizational And Military Community Research |
| OMCVD | Organometallic Chemical Vapor Deposition |
| OMD | Oklahoma Military Department |
| OMDF | Osean Maritime Defense Force |
| OMEL | Operator Minimum Equipment List |
| OMEN | Operation Miner Eighty Niner |
| OMF | Officer Master File |
| OMF | Operational Mission Failure |
| OMFAC | Optical Matched Filter Area Correlator |
| OMFAC | ptical Matched Filter Area Correlator |