Initialism of Antiaircraft Artillery Operations Center.

Initialism of American Association of Aerosol Research. / Initialism of Association for the Advancement of Aging Research.

(US) Initialism of aid to the aged, blind and disabled.

Initialism of Association for the Advancement of Agricultural Sciences in Africa. / Initialism of Australian and Allied All Services Association.

(military) Initialism of army air base. / (military) Initialism of army artillery board. / (military) Initialism of anti-aircraft battery.

Initialism of Association of Applied Biologists. / Initialism of Aircraft Accident Board.

Initialism of Australian Association of Better Hearing.

Alternative form of argh!

Elongated form of awesome.

plural of AAA