U.S. Marine Corps Staff Sgt. Franklin E. Butterfield, a load master instructor assigned to Marine Aerial Refueler Transport Squadron (VMGR) 252, opens a cargo door during a Flight In Support of a Deployed Unit (FISDU) at Moron Air Field, Spain, March 10, 2015. The FISDU was conducted to support Marines assigned to Special Purpose Marine Air Ground Task Force conducting operations in foreign countries. (U.S. Marine Corps photo by Lance Cpl. Koby I. Saunders/Released)