| Abbreviation | Definition |
|---|---|
| ACMT | Aircraft Certification Management Team |
| ACN | Assign Commercial Network |
| ACNS | Assistant Chief of Naval Staff |
| ACO | Administrative Contracting Officer |
| ACO | Air Combat Order |
| ACO | Airspace Control Order |
| ACOA | Adaptive Course Of Action |
| ACOA | Alternative Course of Action |
| ACOB | Air Carrier Operations Bulletins |
| ACOC | Area Communications Operations Center |
| ACOCC | Air Combat Operations Command Center |
| ACodP-1 | Allied Codification Publication number 1 |
| ACOE | Army Common Operating Environment |
| ACOE | Army Communities Of Excellence |
| ACOE | Army Community of Excellence |
| ACOFS | Assistant Chief of Staff |
| ACOG | Advanced Combat Optical Gunsight |
| ACOG | Army Combat Optical Gunsite |
| ACOM | Atlantic Command |
| ACOMS | Air COMMunicationS |