Paladin Gunny

Paladin Gunny is a Brotherhood of Steel Paladin stationed at the Citadel in 2277.

Daily schedule
He can be found in Ring A just outside the lab in the council room, outside in the courtyard training recruits during the daytime, or inside a dormitory in Ring A. He can also disappear for periods of time. Whether if that's a glitch or he goes outside for a "walk", it is not certain.

Interactions with the player character
He can give the Lone Wanderer Power Armor Training and isn't overly happy that the Lone Wanderer gets Power Armor Training without any work involved.

Permission must be granted by Elder Lyons before Gunny will provide the necessary training.

Appearances
Paladin Gunny appears only in Fallout 3.

Behind the scenes
The line he says about relax your muscles when you receive Power Armor Training is a reference to the novel Starship Troopers by Robert A. Heinlein. The narrator uses the same line to describe how soldiers in the Mobile Infantry are trained to wear power armor.