U.S. Air Force Tech Sgt Joe Parker, KC-135 Stratotanker boom operator, 336th Air Refueling Squadron, March ARB, Calif., refuels an F-35A Lightning II Joint Strike Fighters from the 58th Fighter Squadron, 33rd Fighter Wing, Eglin AFB, Fla., May 16, 2013. 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. John R. Nimmo, Sr./RELEASED)