| Abbreviation | Definition |
|---|---|
| OLRT | Operational Liaison and Reconnaissance Team |
| OLS | One Leg Stand |
| OLS | Optical Landing System |
| OLTC | Open Loop Tracking Complex |
| OLTI | Office of Liaison and Technical Information |
| OM | Contour Multiunit |
| OM | Operation Marketgarden |
| OM | Operation Mobilization |
| OM | Operations Manual |
| OM | Order of Merit |
| OM&M | Operations Maintenance and Monitoring |
| OMA | Office of Military Affairs (CIA) |
| OMA | Oklahoma Military Academy |
| OMA | One Man Army |
| OMA | One Mans Army |
| OMA | Operation and Maintenance, Army |
| OMA | Operations and Maintenance, Army |
| OMA | Operations Maintenance Army |
| OMAC | One Man Army Corps |
| OMAR | Operation and Maintenance Army Reserve |