A US Air Force Stealth fighter F-22 Raptor takes off from Kadena Air Base on the southern Japanese island of Okinawa, Aug. 14, 2012. A group of F-22s arrived in Okinawa in late July, their first deployment overseas after the easing of flight restrictions imposed in mid-May because pilots reported dizziness and other symptoms of hypoxia.
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Manuel Balce Ceneta/AP
A pilot's outfit is displayed during a news conference at the Pentagon July 31, 2012, to provide an update on the Air Force Scientific Advisory Board's study into life support systems installed on the F-22.
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M. Scott Moon/Peninsula Clarion/AP
An F-22 fighter jet flies over Joint Base Elmendorf-Richardson in Anchorage, Alaska, Aug. 1, 2010, during the annual Arctic Thunder air show. A search is under way for an F-22 from the base that has been missing in the state’s interior.
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Bill Roth/The Anchorage Daily News/AP
Vapor forms above the Raptor flown by a pilot of the Air Combat Command F-22 Demonstration Team at Joint Base Elmendorf-Richardson, Alaska, on July 26, 2012. Defense Secretary Leon Panetta approved a plan to lift flight restrictions following the ongoing correction of oxygen-deficit problems.
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An F-22 Raptor aircraft deploys flares over Kadena Air Base, Japan, Jan. 15, 2009.
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An F-22 Raptor sits in front of a hanger at Kadena US Air Force Base on Japan's southwestern island of Okinawa June 16, 2009.
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A Raptor prepares to take off at Kadena US Air Force Base on June 16, 2009.
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Ronald Dejarnett/US Navy/AP
An F-22 Raptor executes a supersonic flyby over the flight deck of the aircraft carrier USS John C. Stennis in the Gulf of Alaska June 22, 2009.
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Courtesy of the Pacific Air Force
A ceremony at the Lockheed-Martin plant in Marietta, Georgia, marks the delivery of the first F-22 jet to the Pacific Air Force Feb. 2007.
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An F-22 Raptor fighter plane flies over during a display at the Farnborough aerospace show in Farnborough, England, June 14, 2008.
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An F-22 Raptor performs at the N'Awlins Air Show in Belle Chasse, La., Oct. 26, 2007.
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Pierre DuCharme/The Ledger/AP
A pair of USAF F-22 Raptors fly over the airport during the Sun n' Fun Fly-In at Lakeland Linder Regional Airport in Lakeland, Fla., on April 7, 2006.
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Two F-22 Raptors fly behind a KC-135R Stratotanker aircraft after inflight refueling during a training mission off the coast of Florida April 2, 2007.