U.S. Air Force F-35A Lightning II Joint Strike Fighters from the 58th Fighter Squadron, 33rd Fighter Wing, Eglin AFB, Fla. perform an aerial refueling mission with a KC-135 Stratotanker from the 336th Air Refueling Squadron from March ARB, Calif., May 14, 2013 off the coast of Northwest Florida. The 33rd Fighter Wing is a joint graduate flying and maintenance training wing that trains Air Force, Marine, Navy and international partner operators and maintainers of the F-35 Lightning II. (U.S. Air Force photo by Master Sgt. Donald R. Allen/Released)