| Acronym | Meaning |
 | (A3) | Armor/anti-armor |
| (AA3) | Accident Analysis Computer Program |
| (C3) | Command |
| (C4) | Center For Clouds |
| (ES) | Sporadic E |
| 3CPO | Cloud Chemistry And Cloud Physics Organization |
| 4DDD | Four-Dimensional Data Assimilation |
| A&C | Abatement & Control |
| A&R | Air And Radiation |
| A/C | Aircraft |
| A/C | Air Conditioning |
| A/D | Analog-to-digital |
| A/H | Air Handling |
| A/I | Accident/incident |
| AA | Access Authorization |
| AA | Accountable/activity Area |
| AA | Activity Area |
| AA | Adverse Action |
| AA | Affirmative Action |
| AA | Assistant Administrator |
| AA/EEO | Affirmative Action/equal Employment Opportunity |
| AAA | American Arbitration Association |
| AAAS | American Association For The Advancement Of Science |
| AACR | Angle-American Cataloging Rules |
| AACS | Airborne Activity Confinement System |
| AADT | Average Annual Weekday Traffic |
| AAEE | American Academy Of Environmental Engineers |
| AAG | Association Of American Geographers |
| AAH | Advanced Attack Helicopter |
| AALC | Amphibious Assault Landing Craft |
| AAM | Airborne Activity Monitor |
| AAM | Air-to-air Missile |
| AAOE | Airborne Antarctic Ozone Experiment |
| AAP | Aviation Applications Program |
| AAP | Atmospheric Analysis And Prediction Division |
| AAP | Affirmative Action Program |
| AAP | Asbestos Action Program |
| AAR | Affirmative Action Representative |
| AARADCOM | US Army Armanents R&D Command |
| AARC | Alliance For Acid Rain Control |
| AARP | American Association Of Retired People |
| AAS | American Astronomical Society |
| AAS | Acid Addition System |
| AAS | Atomic Absorption Spectroscopy |
| AASE | Airborne Arctic Stratospheric Expedition |
| AASM | Advanced Air To Surface Missile |
| AASO | Army Aeronautical Service Office |
| AAW | Antiair Warfare |
| AB | Architect Building |
| ABA | American Bar Association |
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