U.S. Soldiers with the 70th Brigade Support Battalion, 210th Fires Brigade, 2nd Infantry Division, conduct quarterly gas chamber training, wearing the Joint Service Lightweight Integrated Suit Technology, known as the JSLIST at Camp Casey in Gyeonggi province, South Korea, Feb. 21, 2013. During the chemical, biological, radiological, and nuclear portion of the training, Soldiers were required to qualify in the gas chamber and then conduct detailed troop decontamination in order to complete the training. (U.S. Army photo by Staff Sgt. Carlos R. Davis/Released)