The gas mask on the cover art of Metro 2033 is the USN MARK V. Despite the world model mask having the filter in front, Artyom screws the filter on the left side. The gas mask being pulled off Artyom's face in the Metro Exodus E3 Trailer resembles an American MCU 2/P or could be a PMK-5, although unlikely because versions of the PMK-5 which ...