| Acronym | Meaning |
 | AFT | After |
| AFTA | Advanced First Term Avionics |
| AFTRBDY | Afterbody |
| AFWL | Air Force Weapons Laboratory |
| AG | Miscellaneous Auiliary Ship |
| AGB | Accessory Gear Box |
| AGDS | Deep Submergence Support Ship (misc) |
| AGEH | Hydrofoil Research Ship (misc) |
| AGF | Miscellaneous Command Ship |
| AGFF | Frigate Research Ship (misc) |
| AGL | Above Ground Level |
| AGM | Missile Range Instrumentation Ship (misc) |
| AGOR | Oceanographic Research Ship (misc) |
| AGOS | Ocean Surveillance Ship (misc) |
| AGP | Patrol Craft Tender (misc) |
| AGR | Air To Ground Ranging |
| AGS | Surveying Ship (misc) |
| AGSI | Stabilized Glide Slope Indicator (shipboard) |
| AGSS | Auxiliary Research Submarine (misc) |
| AH | Hospital Ship (misc) |
| AHD | Ahead |
| AHIP | Army Helicopter Improvement Program |
| AHRS | Attitude Heading Reference System |
| AIB | Action Item Browser |
| AIC | Air Intercept Controller |
| AIC | Allowance Item Code |
| AIC | Anti-ice Command |
| AIF | Airborne Inhabited Fighter |
| AIL | Asset Interchange Language |
| AIM | Authoring Instructional Materials Program |
| AIMD | Aircraft Intermediate Maintenance Dept |
| AIMS | Altitude Identification And Measuring System |
| AIOL | Add Oil Level |
| AIPF | Anti-ice Valve Position Failure |
| AIS | Automatic Information System |
| AIT | Aircraft Interface Tester |
| AIT | Automated Interactive Target |
| AIVP | Anti-ice Valve Position |
| AIVPC | Anti-ice Valve Position Command |
| AIVPFL | Anti-ice Valve Position Failure Left Engine |
| AIVPFR | Anti-ice Valve Position Failure Right Engine |
| AIVPL | Anti-ice Valve Position Left Engine |
| AIVPR | Anti-ice Valve Position Right Engine |
| AIX | Ibm Advanced Interactive Executive Operating System (ibm) |
| AJPO | Ada Joint Program Office |
| AK | Cargo Ship (misc) |
| AKA | Also Known As |
| AL | Aluminum |
| ALC | Alternate Logistic Support Analysis Control Number |
| ALOAF | Asset Library Open Architecture Framework |
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