| 130G | Caterpillar Road Grader Model 130G | GTES |
| 36(b) | Portion of AECA that requires Transfer Notification to US Congress | PG11 |
| 3DELRR | Three Dimensional Expeditionary Long Range Radar | PG11 |
| 3GL | Third Generation Language | |
| 3PL | Third Party Logistics | LCL |
| 4GL | Fourth Generation Language | |
| 5GL | Fifth Generation Language | |
| 621B | Caterpillar Scraper Model 621B | GTES |
| 8A | Section 8A of the Small Business Act pertaining to minority and other disadvantaged business | |
| A SPEC | System Specification | |
| A&D | Applications and Development | CIO |
| A&T | Assembly and Test | PG9 |
| A-109 | OMB Circular A-109, Major Systems Acquisition | |
| A2C2S | Airborne Command and Control System | |
| AA | Air-to-Air | PG11 |
| AA | Anti-Aircraft | PG11 |
| AA&E | Arms, Ammunition, and Explosives | AMMO |
| AAAV | Advanced Amphibious Assault Vehicle | PG11 |
| AAC | Acquisition Advice Code | Facilities |
| AAC | Acquisition Advice Code | Supply |
| AAE | Army Acquisition Executive | |
| AAFS | Fuel System, Amphib Assault | GTES |
| AAL | Additional Authorized Listing | GTES |
| AAM | Air-to-Air Missile | PG11 |
| AAMG | Anti-Aircraft Machine Gun | PG11 |
| AAO | Authorized/Approved Acquisition Objective | AMMO, GTES, PG9, PG1 |
| AAP | Abbreviated Acquisition Program | LCL, PG11 |
| AAR | After Action Report | |
| AAR's | After Action Reports | PG11 |
| AAT | Accelerated Aging Test | AMMO |
| AAV | Amphibious Assault Vehicle | PG11 |
| AAW | Anti-Air Warfare | PG11 |
| AAWS-H | Anti-Armor Weapon system-Heavy | |
| AAWS-M | Advanced Antitank Weapon System-Medium | |
| ABM | Anti-Ballistic Missile | PG11 |
| ABMS | Ammunition Budget Management System | AMMO |
| ABT | Air Breathing Targets | PG11 |
| ABV | Advanced Breacher Vehicle | AMMO |
| ABV | Assault Breacher Vehicle | GTES |
| AC | Alternating Current | PG9, PG11 |