F-35A Lightning IIs from the 58th Fighter Squadron, 33rd Fighter Wing, Eglin AFB, Fla., perform an aerial refueling mission 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/Master Sgt. Donald R. Allen)