Marines with 4th Medical Battalion, 4th Marine Logistics Group, Marine Forces Reserve, carry a casualty in a mass heat casualty exercise during the 4-15 Integrated Training Exercise aboard Marine Corps Air Ground Combat Center, Calif., June 20, 2015. During the mass heat casualty exercise, Marines and sailors faced a situation where multiple casualties were rapidly brought into the medical station, and Marines and Sailors had to work together efficiently to ensure that all casualties were assessed and treated properly. (U.S. Marines Corps photo by Cpl. Ian Ferro)