| Abbreviation | Definition |
|---|---|
| ACS | Air Cavalry Squadron |
| ACS | Air-Capable Ship |
| ACS | Airspace Control System |
| ACS | Arc Combat Soldiers |
| ACS | Armored Cavalry Squadron |
| ACS | Army Communications System |
| ACS | Army Community Service |
| ACS | Asset Control System |
| ACS | Automatic Container System |
| ACS,C4I | Assistant Chief of Staff, Command, Control, Communications, Computers, and Intelligence |
| ACSA | Acquisition and Cross-Servicing Agreement |
| ACSA | Allied Communications Security Agency |
| ACSA | Army of the Confederate States of America |
| ACSAC | Assistant Chief of Staff for Automation and Communications |
| ACSAP | Army Center for Substance Abuse Programs |
| ACSC | Air Command and Staff College |
| ACS-C | Aerial Common Sensor - Corps |
| ACSCOM | Army Component Support Command |
| ACSEP | Aircraft Certification System Evaluation Program |
| ACSES | Aircraft Compatibility Scientific And Engineering Services |