Army recieves gas mask training
U.S. Army Sgt. Ronnie Hoffman, 74th Delta Company chemical trainer, checks the seal of an Alpha 2-1 Air Defense Artillery member’s mask at Kunsan Air Base, Republic of Korea, Sept. 13, 2012. Soldiers learn in the gas chamber how effective and important the gas mask is in real combat. (U.S. Air Force photo/Senior Airman Marcus Morris)