Marines Corps with Marine Aircraft Group 36 Breaks the seal of his mask (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. .

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