| Acronym | Meaning |
 | AAF | Army Airfield |
| AAFES | Army And Air Force Exchange Service |
| AAM | Army Achievement Medal; Air-to-Air Missile (see ATAM); Automated Acquisition Module |
| AAR | After-Action Review (formerly After-Action Report); Air-to-Air Receive; Air-to-Air Refueling; Aircraft Accident Report |
| ABN | Airborne |
| AC | Aircraft Commander; Active Component; Alternating Current; Aircraft; Aircraft Carrier; Air Conditioning; Air Controller; Aircrew; Armament Computer; Associate Contractor |
| ACU | Army Combat Uniform; Assault Craft Unit; Annunciator Control Unit; Automatic Calling Unit; Administrative Control Unit |
| AIT | Advanced Infantry Training; Advanced Individual Training (specialty Training Post-BCT); Aircraft Interface Tester; Automated Interactive Target; AUTODIN Interface Terminal; Automated Identification Technology |
| ALICE | All-purpose Lightweight Individual Carrying Equipment |
| AMF | Army Modular Force |
| AN | Army/Navy; See JETDS |
| ANCOC | Advanced Noncommissioned Officer Course |
| AO | Accounts Office; Acquisition Objective; Action Officer; Aircraft Operator; Oiler (underway Replenishment); Administration Officer; Air Officer; Area Of Operations; Aviation Ordnance Person |
| AOC | Air And Space Operations Center; Air Operations Center; Army Operations Center; Air/Oil Cooler; Approach On Course; Auxiliary Output Chips; Aviation Ordnance Chief; Area Of Concentration |
| AOO (AO) | Area Of Operations; Aviation Ordnance Officer |
| AOR | Area Of Responsibility; Allowance Overrides; Annual Operating Requirement; Area Of Operations; Replenishment Oiler (underway Replenishment) |
| APC | Armored Personnel Carrier; Acquisition Professional Community; Accelerated Provision Concepts; Account Processing Code; Activity Process Codes; Agency Program Coordinator; Air Project Coordinator; Aerial Port Commander; Assign Pre-programmed Conference (l |
| APFT | Army Physical Fitness Test |
| ARCAM | Army Reserve Component Achievement Medal |
| ARCOM | Army Commendation Medal |
| ARFORGEN | Army Force Generation |
| ASAP | As Soon As Possible (pronounced AY-sap) |
| ASCC | Army Service Component Command |
| ASI | Additional Skill Identifier |
| ASOC | Air Support Operations Center |
| AST | Area Support Team |
| ASW | Anti-Submarine Warfare; Average Surface Wind |
| ATAM | Air-To-Air Missile |
| AVF | All-Volunteer Force |
| AWOL | Absent Without Official Leave. Not At One's Place Of Duty |
| AWR | Air Worthiness Release |
| B/N | Bombardier/Navigator. The Observer On A US Air Force Fighter-bomber. |
| BAH | Basic Allowance For Housing (formerly BAQ) |
| BAQ | Basic Allowance For Quarters; Basic Aircraft Qualification |
| BCD | Bad Conduct Discharge; Binary-Coded Decimal; Battlefield Coordination Detachment |
| BCT | Basic Combat Training (familiarly Basic Training Or Basic) |
| BDU | Battle-Dress Uniform; Bomb Dummy Units |
| BEQ | Bachelor Enlisted Quarters |
| BLUF | Bottom Line Up Front (i.e. |
| BNCOC | Basic Noncommissioned Officer Course |
| BOG | Beach Operations Group |
| BOQ | Bachelor Officers' Quarters |
| BRM | Basic Rifle Marksmanship |
| BSB | Base Support Battalion |
| BWT | Battlefield Weather Team |
| BX | Base EXchange. Air Force Name For A PX (see Below.) |
| CAB | Combat Aviation Brigade; Cabin; Centralized Accounting & Billing (Navy); Contract Adjustment Board; Cost Analysis Brief; Combat Action Badge |
| CAC | Common Access Card; Community Activity Center |
| CAPE | Corrective Action Through Physical Exercise |
| CASEVAC | CASualty EVACuation |
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