UAC Mars Base

Mars Base is a location mentioned in Doom and Doom 2 manuals. It is a UAC facility on Mars.

Background
Mars Base is the home of some of UAC's radioactive waste facilities.

This is were the Marine of Doom 1 was stationed after he was sent to Mars after attacking an officer on Earth. He spent some three years there before being deployed to Phobos to stop an invasion there.

In Doom 2 the backstory is that the Marine or a Marine stopped a parallel invasion of Mars Base before flying back home in a drop pod on shore leave. He was the only survivor. Only to discover Earth was invaded. This parallels the plot of Doom 3 (and Doom RPG).

Doom Snes
An image showing Mars shows that a large section of Mars has apparently been colonized.

Doom 3
See also UAC Mars Research Base