Harold Callahan

Harold Callahan was a Military Police officer stationed at the Pentagon.

Background
Armed with his .44 Magnum revolver, Callahan was stationed at the Pentagon as an MP in the months leading up to the Great War. He responded to several incidents amongst Pentagon staff, such as General Robert Dobbs' shooting of a Vending Machine.

Appearances
Harold Callahan is mentioned only in the Fallout 3 add-on Broken Steel.

Behind the scenes
The character (along with his Magnum sidearm) is a reference to San Francisco Inspector Harry Callahan, protagonist of the Dirty Harry movies. The game guide also quotes a line from the film.