U.S. Marines with Combat Logistics Regiment 37 prepare to evacuate simulated casualties during a Chemical Biological Radiological and Nuclear (CBRN) training exercise on Camp Kinser, Okinawa, Japan on August 22, 2012. The Marines of CLR-37 conducted the evaluation portion of their training for the CBRN course. The evaluation was conducted to test the Marines' ability to perform in a simulated stress environment. (U.S. Marine Corps photo by Cpl. Carl Payne/Released).