| Abbreviation | Definition |
|---|---|
| ATIWG | ATCCS (Army Tactical Command and Control System) Interoperability Working Group |
| ATIWG | ATCCS Interoperability Working Group |
| ATIZ | Artillery Target Information Zone |
| ATK | Attack |
| ATKHEL | Attack helicopter |
| ATL | Across The Line |
| ATL | At The Limit |
| ATL | Authentic Transformational Leadership |
| ATLAS | A Total Look At Support |
| ATLAS | Assessment Tool for Land Systems |
| ATLS | Advanced Trauma Life Support |
| ATM | Advanced Trauma Management |
| ATM | Air Target Material |
| ATM | Anti-Tactical Missile |
| ATM | Anti-Tank Mine |
| ATM | Anti-Tank Missile |
| ATM | Army Ten Miler |
| ATM | Army Ten-Miler |
| ATM | Assign Traffic Metering |
| ATM | Asynchronous Transfer Mode |