U.S. Marine Corps photo by Lance Cpl. Levi Schultz/Released 150827-M-PS017-020.JPG
Sep 2, 2015
Sgt. Heather Keasler, administrative specialist, Headquarters Battalion, engages in exercises during annual training in the confidence chamber at Range 105, Aug. 27, 2015. CBRN defense specialists burned tablets of Chlorobenzylidene Malononitrile gas to test the Marines confidence with the M50 joint service general purpose mask. (Official Marine Corps photo by Pfc. Levi Schultz/Released)
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