This March 30, 2010 photo made available by the U.S. Air Force via NASA shows the X-37B Orbital Test Vehicle during testing at the Astrotech facility in Titusville, Fla. On Tuesday, Dec

 

              This March 30, 2010 photo made available by the U.S. Air Force via NASA shows the X-37B Orbital Test Vehicle during testing at the Astrotech facility in Titusville, Fla. On Tuesday, Dec
This March 30, 2010 photo made available by the U.S. Air Force via NASA shows the X-37B Orbital Test Vehicle during testing at the Astrotech facility in Titusville, Fla. On Tuesday, Dec. 11, 2012, the Air Force launched the top-secret, unmanned mini-space shuttle from Cape Canaveral, Fla. (AP Photo/U.S. Air Force via NASA)