U.S. Army Sgt. Dan Adams, left, and Spc. Diego Aguilar place a lit candle in a gas chamber to melt capsules of a chemical compound used to produce CS gas during annual chemical agent training at Fort Bragg, N.C., April 29, 2013. Both were assigned to the 82nd Airborne Division's 1st Brigade Combat Team as chemical, biological, radiological and nuclear specialists.  (U.S. Army photo by Staff Sgt. Mary Katzenberger/Released)
Staff Sgt. Mary Katzenberger
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