| Abbreviation | Definition |
|---|---|
| A/L | Approach/Landing |
| A/M | Approach and Moor |
| A/MLCMC | Aviation/ Missile Life Cycle Management Command |
| A/N | AlphaNumeric |
| A/NM | Administrative/Network Management |
| A/P | Autopilot |
| A/S | Air-to-Surface |
| A/S | Anti-Spoofing |
| A0 | FAAD C2I Workstation computer unit |
| A1C | Airman First Class - USAF |
| A2 | Algorithmic Architecture |
| A2 | Anti-Armor |
| A-2 | Intelligence Staff section of United States Army Air Corps |
| A2AD | Anti-Access/Area-Denials |
| A2ATD | Anti-Armor Advanced Technology Demonstrator |
| A2C2 | Army Airborne Command and Control |
| A2C2 | Army Airspace Command and Control |
| A2C2S | Army Airborne Command and Control System |
| A2I2K | Army Airborne Intelligence 2000 |
| A2S3 | AFATDS Application Software Segment Specification |