| Abbreviation | Definition |
|---|---|
| ACSI | Assistant Chief of Staff for Intelligence |
| ACSIM | Assistant Chief of Staff for Information Management |
| ACSIM | Assistant Chief of Staff for Installation Management |
| ACSL | Advanced Continuous Simulation Language |
| ACSN | Advanced Change Study Notice |
| ACSP | Automated Control System Perimeter |
| ACSR | Ammunition Controlled Supply Rate |
| ACSS | Aviation Communication Surveillance System |
| ACSSP | Air Carrier Standard Security Plan |
| ACSSP | Air Carriers Security Standard Procedures |
| ACSU | Anti Corruption And Security Unit |
| ACSU | Army Cadet Service Uniform |
| ACSW | Advanced Crew Served Weapon |
| ACSWP | Aircraft Cross-Servicing Working Party |
| ACT | Active Control Technology |
| ACT | Activity |
| ACT | Advance Civilian Team |
| ACT | Advanced Cell Training |
| ACT | Advanced Concepts and Technology |
| ACT | Air Control Team |