Only two SR-71 Blackbird hangars remain on Beale Air Force Base's flight-line, Aug. 2, 2013. The demolition of the Blackbird hangars is a part of Air Force's "20/20 by 2020" initiative, which aims to reduce excess capacity by reducing a base's footprint, as well as reduce operating costs by 20 percent by the year 2020. (U.S. Air Force photo by Staff Sgt. Robert M. Trujillo/Released)
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