U.S. Marine Cpl. Shep Tucker, a chemical, biological,

U.S. Marine Cpl. Shep Tucker, a chemical, biological, radiological and nuclear defense specialist with Company C, Marine Wing Support Squadron 373, Special Purpose Marine Air Ground Task Force – Crisis Response - Central Command, applies a tourniquet to a simulated casualty during the final exam of a combat lifesaver course, June 17, 2016. SPMAGTF-CR-CC is currently forward deployed in several host nations, with the ability to respond, rapidly, to a variety of contingencies.(U.S. Marine Corps photo by Sgt. Donald Holbert/Released)