An F-35B Lightning II with Marine Fighter Attack Squadron (VMFA) 121 takes off from Red Beach on Marine Corps Base Camp Pendleton, Calif., Dec. 10. This is the first time that the F-35 conducted close air support missions in support of exercise Steel Knight. (U.S. Marine Corps photo by Sgt. Brian Marion/Released) - An F-35B Lightning II with Marine Fighter Attack Squadron (VMFA) 121 takes off from Red Beach on Marine Corps Base Camp Pendleton, Calif., Dec. 10. This is the first time that the F-35 conducted close air support missions in support of exercise Steel Knight. (U.S. Marine Corps photo by Sgt. Brian Marion/Released)