| AACO | AIDS Activities Coordinating Office |
|---|---|
| AACO | Assault Airlift Control Officer |
| AAD | Automatic Activation Device |
| AANS | Afroasian News Service (skr.) |
| AAO | Area Audit Office |
| AAS | Aging and Adult Services |
| AAS | Airport Advisory Service |
| AAS | Alliance of AIDS Services (skr.) |
| AAS | American Auto Service |
| AAS | Annapolis Apple Slice |