Marines with 4th Medical Battalion, 4th Marine Logistics Group, Marine Forces Reserve, extract a casualty from a aircraft during a mass casualty exercise during 4-15 Integrated Training Exercise aboard Marine Corps Air Ground Combat Center, Twentynine Palms, Calif., June 20, 2015. During the exercise Marines and Sailors worked together to perform a casualty rescue, where victims were extracted or boarded onto an aircraft and transported to a field medical station. (U.S. Marine Corps photo by Cpl. Ian Ferro)