CAMP CASEY, South Korea " Pfc. Christian Groce, from Cleveland, Ohio, a human resources specialist assigned to Headquarters and Headquarters Battery, 210th Fires Brigade, 2nd Infantry Division, winces as he exits the gas chamber during chemical, biological, radiological, and nuclear training on Camp Casey, South Korea, Oct. 24, 2013. The 210th Fires Brigade is dedicated to improving the unit's readiness to "Fight Tonight" to defend the Korean peninsula from any threat. (U.S. Army photo by Cpl. Kim Han-byeol, 210th Fires Brigade public affairs specialist/Released).