U.S. Marines with Marine Wing Support Squadron (MWSS) 372 refuel an F-35B Lightning II from Marine Fighter Attack Squadron (VMFA) 121 at a Forward Arming and Refueling Point (FARP) aboard Marine Corps Base, Camp Pendleton, Calif., Dec. 10, 2015. VMFA-121 marked another important milestone in the evolution of the aircraft conducting their first Close Air Support (CAS) missions in support of ground combat elements during exercise Steel Knight 16. (U.S. Marine Corps Combat Camera Photo by Chief Warrant Officer 2 Wade E. Spradlin/Released)