| Abbreviation | Definition |
|---|---|
| ACM3 | Aviation Carpenter's Mate 3rd Class Petty Officer |
| ACMM | Aviation Chief Machinist's Mate |
| ACMMAC | Aviation Chief Machinist's Mate (combat Aircrewman) |
| ACMMC | Aviation Chief Machinist's Mate (carburetor Mechanic) |
| ACMMF | Aviation Chief Machinist's Mate (flight Engineer) |
| ACMMH | Aviation Chief Machinist's Mate (hydraulic Mechanic) |
| ACMMI | Aviation Chief Machinist's Mate(instrument Mechanic) |
| ACMMP | Aviation Chief Machinist's Mate (propeller Mechanic) |
| ACMMT | Aviation Chief Machinist's Mate (turbine Mechanic) |
| ACNB | Australian Commonwealth Naval Board |
| ACNS | Assistant Chief of the Naval Staff |
| ACOM | Aviation Chief Ordnanceman |
| ACOMT | Aviation Chief Ordnanceman (turret Mechanic) |
| ACR | Aviation Chief Rigger |
| ACR1 | Air Controlman (radar) Petty Officer 1st Class |
| ACR2 | Air Controlman (radar) Petty Officer 2nd Class |
| ACR3 | Air Controlman ((radar)) Petty Officer 3rd Class |
| ACRAA | Air Controlman (radar) Airman Apprentice |
| ACRAN | Air Controlman (radar) Airman |
| ACRAR | Air Controlman (radar) Airman Recruit |