| Abbreviation | Definition |
|---|---|
| AMSAN | Aviation Structural Mechanic (structural) Airman |
| AMSAR | Aviation Structural Mechanic (structural) Airman Recruit |
| AMSC | Aviation Structural Mechanic (structural) Chief Petty Officer |
| AN | Airman |
| ANAF | Army Navy Air Force |
| ANLS | Advanced Naval Lighting Systems |
| ANME | Army Navy Military Expo |
| ANMT | All Navy Message To |
| ANPA | Archi Navy Photo Archive |
| ANSO | Association of Naval Services Officers |
| ANU | Authorised for Navy Use |
| ANU | Authorized Navy Use |
| AO1 | Aviation Ordnanceman Petty Officer 1st Class |
| AO2 | Aviation Ordnanceman Petty Officer 2nd Class |
| AO3 | Aviation Ordnanceman Petty Officer 3rd Class |
| AO9 | American Operative 9 |
| AOAA | Aviation Ordnanceman Airman Apprentice |
| AOAN | Aviation Ordnanceman Airman |
| AOAR | Aviation Ordnanceman Airman Recruit |
| AOC | Aviation Ordnanceman Chief Petty Officer |