The M5-11-7 Assault Gas Mask was made in 1943, around the same time as the M3 by Mine Safety Appliances, intended to be a lightweight gas mask for use by paratroopers and assault troops because the older M1, M2, M3, and M4 Service Masks used combersome hoses that could impede a soldier's movement. It is one of the most sought after mask by collectors due to its usage in the Normandy Landings in 1944. The M5 was later deemed obsolete and removed from service in 1947, but still used as a special purpose mask during the Korean War.