The U.S. Air Force Demonstration Squadron, the Thunderbirds, execute a crossover at Langley Air Force Base, Va., May 13, 2011. The team will perform their first-ever air show with bio-fuel at the Joint Services Open House at Joint Base Andrews May 19 - 21. (U.S. Air Force photo by Airman 1st Class Kayla Newman)(RELEASED)

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Photo by: Airman st Class Kayla NewmanReleased |  VIRIN: 110513-F-KB808-990.JPG