Lance Cpl. Andres Cornejo, a semitrailer refueler operator

Lance Cpl. Andres Cornejo, a semitrailer refueler operator with General Service Motor Transportation Company, Combat Logistics Regiment 1, 1st Marine Logistics Group, provides instruction to Lance Cpl. Ary Leura, a student driver with CLR-1, 1st MLG, during the Semitrailer Refueler Operator’s Course aboard Camp Pendleton, Calif., Jan. 16, 2014. Each refueler holds approximately 4,900 gallons of fuel, providing forward Marine Corps units with an increased range of operations in a combat environment or during humanitarian missions by allowing them to travel longer distances and keep utility equipment operating. Cornejo is a native of San Antonio, Texas. (U.S. Marine Corps photo by Lance Cpl. Shaltiel Dominguez/ Released)