U.S. Marine Corps photo by Lance Cpl. Preston McDonald/Released 160108-M-OD000-014.JPG
Jan 13, 2016
A Marine with 2nd Marine Logistics Group breaks the seal on his mask after entering the gas chamber at Marine Corps Base Camp Lejeune, N.C., Jan. 8, 2016. Marines, while exposed to chlorobenzylidene malononitrile, or CS gas, must conduct a series of exercises before breaking the seal on their mask followed by properly don and clearing it. The chamber is a routine exercise to ensure the durability of each Marines gear while exposed to chlorobenzylidene malononitrile, or CS gas, which is a bi-annual qualification requirement for Marines.
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