| Abbreviation | Definition |
|---|---|
| AOP | Additive Operational Product/Project |
| AOP | Air Operations Plan |
| AOP | Approved Operating Program |
| AOP | Area Of Probability |
| AOP | Army Order of Precedence |
| AOR | Always Out Refueling |
| AOR | Annual Operating Requirement |
| AOR | Area of Responsibility |
| AOR | Army Of Retards |
| AOR | Auxiliary, Oiler, Re-supply |
| AORS | Army Operations Research Symposium |
| AOS | Acquisition of Signal |
| AOS | Add-On Stabilization |
| AOS | Area Of Separation |
| AOS | Area of Specialization |
| AOSD | Army Operations Security Detachment |
| AOSM | Army of Occupation Service Medal |
| AOSS | Aviation Ordnance Safety Supervisor |
| AOT | Army Of Tennessee |
| AOTC | Army Of The Cumberland |