Peter McCain

Doctor Peter McCain was an American OSS spy who worked for Group 935 undercover.

Verruckt
He was stationed at Verruckt where marines attempted to extract him. After Tank Dempsey was captured, he unleashed all the zombies at the asylum and turned the power off. However, he was bit on the arm by a zombie and lost his arm, which still clutched the power switch at the asylum.

Shi No Numa
He parachuted to Shi No Numa, where he was later killed and hung by Doctor Edward Richtofen.

Gorod Krovi
In an alternate timeline, he was killed above Stalingrad, Russia. His parachute was used by Origins Dempsey, Nikolai, Richtofen and Takeo to parachute to safety and meet the original Nikolai.