| Abbreviation | Definition |
|---|---|
| OCIE | Organizational Clothing and Individual Equipment |
| OCIR | Operational Capability Improvement Request |
| OCJCS | Office of The Chairman of The Joint Chiefs of Staff |
| OCJCS-PA | Office of The Chairman of The Joint Chiefs of Staff-Public Affairs |
| OCLAR | Ohio Class Liaison Action Record |
| OCLL | Office of the Chief of Legislative Liaison |
| OCM | Oil Cleansing Method |
| OCMH | Office Chief of Military History |
| OCMH | Office of the Chief of Military History |
| OCNB | Office of the Chief, National Guard Bureau |
| OCO | Offload Control Officer |
| OCONUS | Outside Continental United States |
| OCONUS | Outside the Continental United States |
| O-CONUS | Outside Continental United States |
| OCOP | Outline Contingency Operation Plan |
| OCP | Operational Configuration Processing |
| OCP | Out Of Control Punjabi |
| OCPA | Office of the Chief of Public Affairs |
| OCPO | Office of Corrosion Policy and Oversight |
| OCPW | Organisation for the Prohibition of Chemical Weapons |