Pilots with Marine Fighter Attack Squadron (VMFA) 121 exit F-35B Lightning II’s after conducting training during exercise Red Flag 16-3 at Nellis Air Force Base, Nev., July 20. This is the first time that the fifth generation fighter has participated in the multiservice air-to-air combat training exercise. (U.S. Marine Corps photo by Lance Cpl. Harley Robinson/Released) - Pilots with Marine Fighter Attack Squadron (VMFA) 121 exit F-35B Lightning II’s after conducting training during exercise Red Flag 16-3 at Nellis Air Force Base, Nev., July 20. This is the first time that the fifth generation fighter has participated in the multiservice air-to-air combat training exercise. (U.S. Marine Corps photo by Lance Cpl. Harley Robinson/Released)