A U.S. Marine with Combat Logistics Battalion (CLB), assigned to 31st Marine Expeditionary Unit (MEU), provides security during a mass casualty exercise on Camp Hansen, Okinawa, Japan, June 13, 2013. The 31st MEU regularly conducts various different types of training to improve mission readiness and to ensure the MEU is capable to carry out any type of contingency mission that might occur during the seasons patrol. (USMC photo by LCpl T.S. Dietrich, 31st MEU Combat Camera)