U.S. Marines with Headquarters and Service Company, Combat Logistics Regiment 17 (CLR-17), 1st Marine Logistics Group, conduct a Chemical Biological Radiation Nuclear (CBRN) conditioning course on Marine Corps Base Camp Pendleton, Calif., April 18, 2013. CLR-17 Marine takes a break from team building exercises in full protective gear under stressful conditions to prepare for actual emergency situations. (U.S. Marine Corps Imagery by Lance Cpl. Alexander Quiles 1st MLG Combat Camera/Released)