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Maintainers signal to returning Thunderbirds pilots May 16, 2011, during a practice run for an upcoming aerial show during the Joint Services Open House May 20 to 21, 2011, at Andrews Air Force Base, Md. During the show, the Thunderbirds plan to fly with Camelina-based hydrotreated renewable jet fuel. (U.S. Air Force photo/Staff Sgt. Tiffany Trojca)
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