| Abbreviation | Definition |
|---|---|
| OI&A | Office of Intelligence and Analysis (DHS) |
| OIBUA | Operations In Built-Up Areas |
| OIC | Officer In Charge |
| OICC | Officer In Charge of Construction |
| OICC | Operational Intelligence Coordination Center |
| OICW | Objctive Individual Combat Weapon |
| OICW | Objective Individual Combat Weapon |
| OID | Operation Order (OPORD) Identification |
| OIF | Operation Iraqi Freedom |
| OIFK | Operation Iraqi Freedom Kuwait |
| OIMC | Office for International Military Cooperation |
| OIR | Operational and Information Requirements |
| OIR | Operational Intelligence Requirements |
| OIR | Other Intelligence Requirements |
| OIRA | Office of Information and Regulatory Affairs |
| OIS | Officer Indoctrination School |
| OIU | Operator Interface Unit |
| OIW | Operations/ Intelligence Workstation |
| OJ | On the Jugular |
| OJC | Operation Just Cause |