Union Aerospace Corporation

The Union Aerospace Corporation (UAC) is a military-industrial conglomerate that operates the radioactive waste facilities on Mars, as well as on Phobos and Deimos in which Doom takes place. The military, UAC's biggest client, used the latter two facilities to conduct experimental inter-dimensional travel through Gateways. This project grows unstable, and project "volunteers" begin to suffer from a violent form of progressive insanity before finally blowing up. The story begins when distress messages sent from the moons reach Mars, where the player is stationed.

In the Doom Bible, the organization was called UAAF (United Aerospace Armed Forces) and operated on Tei Tenga.