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1 definition by Marcus101RR

The Union Aerospace Corporation (UAC) is a fictional military-industrial conglomerate from the Doom series of video games created by Id Software . Their focus is primarily military weaponry, weapons and defense contracts, aerospace, bio-research, space exploration, and other more sinister scientific endeavors. It is probably named after the infamous Union Banking Corporation, and may have been inspired by the Weyland-Yutani corporation from the Alien films.
The UAC has started another portal to hell!
by Marcus101RR August 22, 2007
20 6