| Abbreviation | Definition |
|---|---|
| OAC | ptical Area Correlator |
| OACSIM | Office, Assistant Chief of Staff for Installation Management |
| OAD | October 1994 AUSA (Association of the United States Army) Demonstration |
| OAD | Operational Availability Data |
| OADR | Originating Agency Determination Required |
| OADR | Originating Agency's Determination Required |
| OAE | Operational Area Evaluation |
| OAF | Ontario Air Force |
| OAF | Operation ALLIED FORCE |
| OAFME | Office of the Armed Forces Medical Examiner |
| OAG | Operations Advisory Group |
| OAI | Oceanographic Area of Interest |
| OAJCG | Operation Alliance Joint Control Group |
| OAKOC | Observation and Fields of fire, Avenues of approach, Key terrain, Obstacles, Cover |
| OAMP | Office of Acquisition Management and Policy |
| OAMP | Operations, Administration, Maintenance, and Provisioning |
| OANG | Ohio Army National Guard |
| OANG | Oregon Air National Guard |
| OAP | Offset Aimpoint |
| OAP | Old Age Pensioner |