U.S. Marine Corps photo by Pfc. Michael T. Gams/Released 090922-M-0000P-004.jpg
Sep 22, 2009
The Marines and sailors of Headquarters Battalion perform jumping jacks while wearing full protective gear in a room filled with o-Chlorobenzylidene Malononitrile, more commonly known as CS gas, in the Combat Center Range 105 gas chamber Sept. 22.
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