Private Murnahan was stationed at Fort Strong while the United States Army developed the M42 "Fat Man" Launcher. At first hearing of the scientists goal of creating a man-portable nuke launcher, he thought they were crazy. When having seen the specifications of this "new" weapon system his curiosity peaked. Both he and Private Bertram decided to sneak to the armory to take a look. After seeing the weapon sitting right in front of him, he believed that it could be just enough to tip the balance of the war in our favor. Particularly noting he would wish to see the looks on the invaders' faces if soldiers were dropped into Anchorage armed with them.
Murnahan is mentioned only in Fallout 4.