R. Roland

"Something happened. I don't know what. I... it was like a shockwave. I... it passed through the entire base."

- R. Roland to the Marine, talking about the demon invasion

R. Roland is a character in Doom 3. A maintenance worker in Mars City, he survives the shockwave that rips through the city during the demon invasion, thus making him the first survivor that the Doomguy encounters. However, the event leaves him frightened. He helps Doomguy by dropping him a ladder so he can get out of the Mars City Underground. He says to Doomguy that he isn't going anywhere, presumably because he is so scared. He tells the player that the safest place to stay is his current position (near the entrance to Mars City Underground) and that up ahead, everything has "changed". He then tells the player to go ahead and bring back help; (which does not exist) however, at this point in the game, the player has been ordered by Sergeant Kelly to fall back to Marine HQ.

Fate
His fate is unknown, but it's possible that he was rescued at the end of the game by the rescue team, assuming he did not leave his hiding spot. There is a good chance he would have lived long enough to be rescued. However, according to the intro to Resurrection of Evil, the only known survivor of the incident on Mars is the player, implying that everyone else was killed off-screen during the course of the game.