F-16 Fighting Falcon Thunderbirds perform a Crossover Break during Joint Base-Langley Eustis’ Air Power over Hampton Roads at Langley Air Force Base, Va., May 13, 2011. As Air Force ambassadors, the Thunderbirds strive to display integrity, selfless service, and excellence embodied by American Airmen. (U.S. Air Force photo/Airman 1st Class Teresa Zimmerman)(RELEASED)