Two SR-71 Blackbird hangars are demolished at Beale Air Force Base, Calif., July 9, 2013. The project is a part of the 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)