Army Acquisition Corps 
Air Armament Center 
Alaskan Air Command 
Advanced Audio Coding 
Acquisition Advice Code 
Aeronautical Administrative Communicat… 
Authorization and Access Control 
Abbreviated Address Calling 
Activity Address Code 
airline administrative communications 
ALLIANCE 
Association of American Colleges 
Automatic Amplitude Control 
Acceptable Ambient Concentration 
Access Authorization Certificate 
Advanced Airspace Concept 
Advanced Audio Codec 
Advanced Audio Compression 
Aeronautics Advisory Council 
Aerospace and Advanced Composites 
American Alpine Club 
amino acid composition 
Army Accessions Command 
Army Air Corps 
Association for Assessment in Counseli… 
Augmentative and Alternative Communica… 
Augmentative and Alternative Communica… 
Australian Agricultural Council 
Autoclaved Aerated Concrete 
Aviation Armament Change