Photos: Historic D-21
A D-21 static display sits at Heritage Park on Beale Air Force Base, Calif., March 14, 2013. The D-21 was an unmaned aerial reconnaissance vehicle, which climbed to altitudes more than 90,000 ft. (U.S. Air Force photo by Airman 1st Class Bobby Cummings/Released)

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Tags: aircraft
Photo by: CummingsReleased |  VIRIN: 130314-F-CY182-010.JPG