U.S. Marine Corps Cpl. Seth Witherup, a crewmaster

U.S. Marine Corps Cpl. Seth Witherup, a crewmaster with Marine Aerial Refueler Transport Squadron (VMGR) 152, observes an MV-22B Osprey with Marine Medium Tiltrotor Squadron (VMM) 263 conduct air-to-air refueling during unit-level training called El Centro Horizon at Naval Air Facility El Centro, California, Dec. 6, 2017. VMGR-152’s mission is to support the Marine Air-Ground Task Force commander by providing aerial refueling and assault support, day or night, under all-weather conditions during expeditionary, joint or combined operations. El Centro Horizon provides VMGR-152 with more opportunities to increase squadron combat readiness through the diverse training ranges available in the area. (U.S. Marine Corps photo by Cpl. Carlos Jimenez)