Marine Corps Cpl Christopher M. Moncrief with Marine aircraft Group 36 breaks Chlorobenzylidene malononitrile capsule in Chemical, Biological, Radiological, Nuclear (CBRN defense training at Marine Corps Air Station Futenma, Okinawa, Japan, Feb. 2. 2017. The gas 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. Marine Corps

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