Miller and Marak

K. Miller and M. Marak are minor UAC marine characters in Doom 3. They are seen in the Mars City Common Area. The two are talking about the people who are coming and going. When you first meet them, they are talking about a member of Bravo Team, Corporal Allen, who was recently shipped back to Earth due to psychological problems. Wondering who's going to replace him and how long he'll last, their questions have been answered when the player arrives to speak to them, which they provide you a couple of cold-hearted greetings in response.

It's likely during the demonic invasion, they set up a defense in the cafeteria but were either killed or turned into Zombies given the amount of blood the area is splattered with.