X-37B Orbital Test Vehicle(01 of08)
Open Image ModalFILE - This Feb. 8, 2011 file image provided by the U.S. Air Force shows the X-37B during encapsulation within the United Launch Alliance Atlas V 5-meter fairing in Titusville, Fla. The unmanned Air Force space plane steered itself to a landing early Saturday, June 16, 2012, at a California military base, capping a 15-month clandestine mission. (AP Photo/US Air Force, File) (credit:AP)
(02 of08)
Open Image ModalA 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, 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) (credit:AP)
(03 of08)
Open Image ModalThis photo released by Vandenberg Air Force Base Monday June 18,2012, shows the X-37B Orbital Test Vehicle, the Air Force's unmanned, reusable space plane, after it landed at Vandenberg Air Force Base early Saturday June 16, 2012. The test vehicle which launched from Cape Canaveral March 5, 2011, conducted on-orbit experiments for 469 days during its mission. The X-37B is the newest and most advanced re-entry spacecraft. (AP Photo/Vandenberg Air Force) (credit:AP)
X-37 Orbital Test Vehicle(04 of08)
Open Image ModalThis 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) (credit:AP)
(05 of08)
Open Image ModalThis Saturday, June 16, 2012 image from video made available by the Vandenberg Air Force Base shows an infrared view of the X-37B unmanned spacecraft landing at Vandenberg Air Force Base. The spacecraft, which was launched from Cape Canaveral Air Force Station in Florida in March 2011, conducted in-orbit experiments during the 15-month clandestine mission, officials said. It was the second such autonomous landing at the base. (AP Photo/Vandenberg Air Force Base) (credit:AP)
(06 of08)
Open Image ModalA United Launch Alliance Atlas V rocket stands ready for launch on the Complex 41 pad at the Cape Canaveral Air Force Station, Monday, Dec. 10, 2012, in Cape Canaveral, Fla. The Atlas V rocket, scheduled to launch on Tuesday, will deploy the U.S. military's X-37B, a prototype spaceplane also called the Orbital Test Vehicle.(AP Photo/John Raoux) (credit:AP)
X-37 Orbital Test Vehicle(07 of08)
Open Image ModalThis April 5, 2010 photo made available by the U.S. Air Force via NASA shows the X-37B Orbital Test Vehicle at the Astrotech facility in Titusville, Fla. Half of the Atlas V five-meter fairing is in the background. 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) (credit:AP)
(08 of08)
Open Image ModalThis Saturday, June 16, 2012 image from video made available by the Vandenberg Air Force Base shows the X-37B unmanned spacecraft landing at Vandenberg Air Force Base. The spacecraft, which was launched from Cape Canaveral Air Force Station in Florida in March 2011, conducted in-orbit experiments during the 15-month clandestine mission, officials said. It was the second such autonomous landing at the base. (AP Photo/Vandenberg Air Force Base) (credit:AP)