LAS VEGAS—Members of the U.S. Air Force Aerial Demonstration Team, the Thunderbirds, sign autographs for NASCAR fans while outside the Las Vegas Motor Speedway during the Nationwide Series Sam's Town 300 here March 1. For more than a decade, the Nellis AFB community and Las Vegas Motor Speedway family have enjoyed a cooperative relationship that both thrills race fans and emblazons the patriotic spirit of America. (U.S. Air Force photo/Master Sgt Robert W. Valenca)
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