1LT | First Lieutenant | |
| 2LT | Second Lieutenant | |
| A | Actor | |
| AA | Adverse Action | |
| AA | Anesthesiologist Assistant | |
| AA | Administrative Assistants | |
| AA | Accredited Appraiser | |
| AA | Accounting Assistant | |
| AAAAI | American Academy of Allergy, Asthma & Immunology | |
| AADC | Advanced Alcohol And Drug Counselor | |
| AADC | Advanced Alcohol Drug Counselor | |
| AAE | ARM Accredited Engineer | |
| AAME | ARM Accredited MCU Engineer | |
| AAMI | Association for the Advancement of Medical Instrumentation | |
| AAMS | Accredited Asset Management Specialist | |
| AAN | American Academy of Neurology | |
| AAOF | Assistant Administrator of Operations and Finance | |
| AAS | Average Annual Salary | |
| AASA | Assistant Area Sales Advisor | |
| AATS | Average Annual Taxable Salary | |
| AAVP | Associate Administrator for Veterans Programs | |
| AB | Administrative Board | |
| ABA | Accredited Business Accountant | |
| ABAI | American Board of Allergy and Immunology | |
| ABCD | Above and Beyond the Call of Duty |
