** FILE ** A United Launch Alliance Atlas V rocket carrying an X-37B experimental robotic space plane lifts off from Launch Complex 41 at the Cape Canaveral Air Force Station on Tuesday, Dec. 11, 2012, in Cape Canaveral, Fla. Air Force officials said the unmanned space plane, which resembles a miniature space shuttle, provides a way to test technologies in space. (AP Photo/John Raoux)

Photo by: John Raoux

** FILE ** A United Launch Alliance Atlas V rocket carrying an X-37B experimental robotic space plane lifts off from Launch Complex 41 at the Cape Canaveral Air Force Station on Tuesday, Dec. 11, 2012, in Cape Canaveral, Fla. Air Force officials said the unmanned space plane, which resembles a miniature space shuttle, provides a way to test technologies in space. (AP Photo/John Raoux)