Basic Combat Training soldiers assigned to E Company, 3rd Battalion, 10th Infantry Regiment wait to enter the gas chamber on July 8, 2013, on Fort Leonard Wood, Mo. The soldiers are exposed to CS gas to build confidence in their M50 series gas mask. (U.S. Army photo by Staff Sgt. Ronald Shaw Jr.)
<br>Unit: 3rd Chemical Brigade
Sgt. 1st Class Ronald Shaw
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