Lance Cpl. Dylan Shuler, 22nd Marine Expeditionary Unit chemical, biological, radiological and nuclear defense specialist and native of Bell Buckle, Tenn., helps Lance Cpl. Jarrod Roper, 22nd MEU CBRN specialist and native of Villa Rica, Ga., don his level "B" protective suit as the Marines prepare to search a subway for casualties and an unknown chemical or biological agent during hazardous material response training at the Guardian Centers in Perry, Ga., June 21, 2013. Split among a reconnaissance and sampling team, the Marines searched for casualties, marking them with glow sticks for later rescue, located the chemical agent responsible for the simulated incident and sampled it to determine what it was and how to best eliminate the threat and treat the casualties. Eleven CBRN Marines attended the weeklong course, which was custom-tailored to the needs of the 22nd MEU and follows the CBRN Marines’ technical rescue training at the end of May. (Marine Corps photo by Sgt. Austin Hazard/Released) - Lance Cpl. Dylan Shuler, 22nd Marine Expeditionary Unit chemical, biological, radiological and nuclear defense specialist and native of Bell Buckle, Tenn., helps Lance Cpl. Jarrod Roper, 22nd MEU CBRN specialist and native of Villa Rica, Ga., don his level "B" protective suit as the Marines prepare to search a subway for casualties and an unknown chemical or biological agent during hazardous material response training at the Guardian Centers in Perry, Ga., June 21, 2013. Split among a reconnaissance and sampling team, the Marines searched for casualties, marking them with glow sticks for later rescue, located the chemical agent responsible for the simulated incident and sampled it to determine what it was and how to best eliminate the threat and treat the casualties. Eleven CBRN Marines attended the weeklong course, which was custom-tailored to the needs of the 22nd MEU and follows the CBRN Marines’ technical rescue training at the end of May. (Marine Corps photo by Sgt. Austin Hazard/Released)