Sgt. Phillip Michael, a chemical, biological, radiological, and nuclear defense (CBRN) instructor with the School of Infantry-East, ignites chlorobenzylidene malononitrile (CS) tear gas tablets during annual gas chamber training aboard Camp Geiger, , April 11, 2008. ( Marine Corps photo by Lance Cpl. David B. Nygren/Released) School of Infantry-East training 080411-M-FR675-020

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