5/9/2012 - Maintainers with the Marine Fighter Attack Squadron-501 watch as the F-35B Lightning II joint strike fighter performs an engine run May 7 at Eglin Air Force Base, Fla. (U.S. Air Force photo/Samuel King Jr.)

5/9/2012 - The F-35B Lightning II joint strike fighter performs an engine run underneath a sun shade on the 33rd Fighter Wing flightline May 7 at Eglin Air Force Base, Fla. (U.S. Air Force photo/Samuel King Jr.)

5/9/2012 - Sgt. Adrian Sanchez, a maintainer with the Marine Fighter Attack Squadron-501, watches as the F-35B Lightning II joint strike fighter performs an engine run May 7 at Eglin Air Force Base, Fla. (U.S. Air Force photo/Samuel King Jr.)

5/9/2012 - Sgt. Brandon Jones, a maintainer with the Marine Fighter Attack Squadron-501, monitors the F-35B Lightning II joint strike fighter during an engine run May 7 at Eglin Air Force Base, Fla. (U.S. Air Force photo/Samuel King Jr.)

5/9/2012 - Maintainers with the Marine Fighter Attack Squadron-501 watch as the F-35B Lightning II joint strike fighter performs an engine run May 7 at Eglin Air Force Base, Fla. (U.S. Air Force photo/Samuel King Jr.)