The Marines were a small strike team of four marines sent to the Group 935 facility, the asylum, to extract Peter McCain. Their squad leader was Tank Dempsey, who was the only survivor of the mission. When they reached the asylum, Peter was nowhere to be found. Tank doesn't remember any of this, as his memory was wiped as a side effect of Richtofen's experiments on him with Element 115, but he is slowly beginning to remember. The Marines are the playable characters in the zombie maps Nacht der Untoten and Verrückt, but are replaced by the four main characters in the Call of Duty: Black Ops versions of the maps.