First Lt. Nicholas Mueller, assistant plans officer, 1st Battalion, 22nd Infantry Regiment, 1st Brigade Combat Team, 4th Infantry Division, seals his M40-series protective mask during mask confidence training at the Fort Carson chemical, biological, radiological and nuclear gas chamber, Aug 10, 2012. To validate their effectiveness, soldiers removed their masks for five seconds before replacing them, expelling any gas trapped inside, and resealing the masks to their faces.
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FORT CARSON, CO, US
This work, Gas! Gas! Gas! [Image 1 of 6], by SPC Andrew Ingram, identified by DVIDS, is free of known copyright restrictions under U.S. copyright law.