U.S. Air Force Staff Sgt. Ian-Wayne Thorton, 57th Aircraft Maintenance Squadron crew chief, goes over pre-flight check before launching a F-22 Raptor Sept. 21, 2011 at Nellis Air Force Base Nev., for its first flight since an Air Combat Command directed stand-down of the entire F-22 fleet May 3, 2011. The Raptors were grounded as a safety precaution, following 12 separate reported incidents where pilots experienced hypoxia-like symptoms. Officials remain focused on the priorities of aircrew safety and combat readiness. The return-to-fly plan implements several risk-mitigation actions, to include rigorous inspections, training on life-support systems and continued data collection. (U.S. Air Force photo by Tech. Sgt. Michael R. Holzworth/Released)
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