Sgt. Platner volunteered to go outside today to take specific readings on the atmosphere. It seems the radiation has not spread this far. Since he was wearing his Power Armor, there was no threat to him from radiation, but if he had been exposed he would have had to be exiled. We don't have adequate decontamination facilities here.
”— Roger Maxson
Sergeant Platner was soldier in the U.S. Army, stationed at the Mariposa Military Base in 2077.
Platner was a part of the security team at the Mariposa Military Base under the command of Colonel Robert Spindel. He volunteered to go outside after the bombs fell to monitor the radiation levels. Led by Roger Maxson, he became one of the first Brotherhood of Steel members.
Sergeant Platner is mentioned only in Fallout and Fallout 3.