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Petty Officer 1st Class Zachary Silveus, right, evaluates students after 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) - Petty Officer 1st Class Zachary Silveus, right, evaluates students after 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)