| Acronym | Meaning |
 | ALPS | Automated Library Publishing System |
| ALRT | Alert |
| ALT | Altimeter |
| ALT | Altitude |
| ALTAIR | Automated Labor/time And Attendance Input And Reporting |
| ALTMS | Automated Library Technical Manual System |
| ALWT | Advanced Lightweight Torpedo |
| AM | Amplitude Modulation |
| AMAC | Aircraft Monitor Control |
| AMC | Acquisition Method Code |
| AME | Aviation Metalsmith (environmental Control Syst) |
| AMP | Acquisition Management Plan |
| AMRAAM | Advanced Medium Range Air-to-air Missile |
| AMS | Asset Management System |
| AMSDL | Acquisition Management System And Data Requirements List |
| AMST | Advanced Medium Range Stol Transport |
| ANDVT | Advanced Narrowband Digital Voice Terminal |
| ANS | Artificial Neural Systems |
| ANSI | American National Standards Institute |
| ANT | Antenna |
| ANT/DET | Antenna/detector |
| ANVIS | Aviator's Night Vision Imaging System |
| AO | Oiler (underway Replenishment) |
| AOA | Angle Of Attack |
| AOE | Fast Combat Support Ship (underway Replenishment) |
| AOG | Gasoline Tanker (misc) |
| AOILL | Add Oil Left Engine |
| AOILR | Add Oil Right Engine |
| AOR | Annual Operating Requirement |
| AOR | Replenishment Oiler (underway Replenishment) |
| AOT | Transport Oiler |
| AP | Acquisition Plan |
| AP | Transport (misc) |
| APADE | Automated Purchase And Accounting Data Entry |
| APARS | Automated Printing And Retrieval System |
| APB | Self-propelled Barracks Ship (misc) |
| APC | Acquistion Professional Community |
| APC | Approach Power Compensator |
| API | Armor Piercing Incendiary |
| APL | Allowance Parts List |
| APN | Aviation Procurement Navy |
| APN1 | Apn Funds Budget One, Weapon System Production Dollars |
| APN2 | Apn Funds Budget Area Two, Minor Non-weapon System <$10k |
| APN3 | Apn Funds Budget Area Three, Non-weapon System Procurement |
| APP | Advanced Procurement Plan |
| APP | Applications Portability Profile |
| APPL/A | Ada Process Programming Language Based On Aspen |
| APPR | Approach |
| APROX | Approximately |
| APS | Avionic Processing System |
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