F-35 Refueling

An F-35A Lightning II approaches a KC-135 Stratotanker during aerial refueling May 13, 2013, near Eglin Air Force Base, Fla. The initial cadre of Air Force F-35 instructor pilots at the 33rd Fighter Wing recently qualified in aerial refueling for the joint strike fighter. The 33rd FW is responsible for F-35 A/B/C Lightning II pilot and maintainer training for the Marine Corps, the Navy, the Air Force and, in the future, at least eight coalition partners. The KC-135 is assigned to the 336th Air Refueling Squadron, March AFB, Calif. (U.S. Air Force photo/Master Sgt. John Nimmo)

F-35 Lightning II

An advanced F-35 Lighting II joint strike fighter taxis on Eglin Air Force Base, Fla. arriving to the Air Education Training Command F-35 schoolhouse, May 6, 2013. The F-35’s arrival will be a major training effort at the schoolhouse, and allow all military branches to train on the newest platform. (U.S. Air Force photo by Staff Sgt. Nicholas Egebrecht)

F-35 Lightning II

An advanced F-35 Lighting II joint strike fighter taxis on Eglin Air Force Base, Fla. arriving to the Air Education Training Command F-35 schoolhouse, May 6, 2013. The F-35’s arrival will be a major training effort at the schoolhouse, and allow all military branches to train on the newest platform. (U.S. Air Force photo by Staff Sgt. Nicholas Egebrecht)

F-35 Lightining II at Nellis AFB

A Lockheed Martin F-35 Lightning II lands Wednesday, March 6, 2013, at Nellis Air Force Base, Nev. The aircraft will be assigned to the 422nd Test and Evaluation Squadron and the aircraft will be used for development test support, force development evaluation and supporting operational test aircraft at Edwards Air Force Base, Calif. (U.S. Air Force photo/Airman 1st Class Jason Couillard)

F-35 Lightining II at Nellis AFB

Maj. Gen. Jeff Lofgren (left) and Brig. Gen. Charles Moore wait to greet the pilots of the two F-35 Lighting IIs that arrived Wednesday, March 6, 2013, at Nellis Air Force Base, Nev. The aircraft are assigned to the 422nd Test and Evaluation Squadron and their modern engine delivers more than 60 percent more thrust than other aircraft of the same weight. Lofgren is the U.S. Air Force Warfare Center commander and Moore is the 57th Wing commander. (U.S. Air Force photo/Lawrence Crespo)

F-35 Lightining II at Nellis AFB

A crew chief assigned to the 57th Aircraft Maintenance Squadron Lightning Aircraft Maintenance Unit marshals an F-35 Lightning II into its parking spot after arriving Wednesday, March 6, 2013, at Nellis Air Force Base, Nev. The two F-35s will be assigned to the 422nd Test and Evaluation Squadron. (U.S. Air Force photo/Lawrence Crespo)