A hospital corpsman assess a simulated patient during a casualty evacuation drill on Marine Corps Air Station Futenma, Dec. 8, 2015. The casevac course is two weeks long and gives the students a better understanding of what it means to be a corpsman. The corpsmen are with various units with III Marine Expeditionary Force. (U.S. Marine Corps photo by Cpl. Ryan C. Mains/ Released)