OTV-4 (X-37B) (USA 261) (AFSPC-5) & ULTRASat cubesat deployerAtlas V 501 United Launch Alliance Launch Status Success Wed ยท May 20th, 2015 11:05 AM - 1:00 PM EDT Watch Online https://www.youtube.com/watch?v=AeQbY4rkQJ8 Mission OTV-4 (X-37B) (USA 261) ( AFSPC-5) & ULTRASat cubesat deployer Type: Government/Top Secret It is the second flight of the second Boeing X-37B vehicle and the fourth flight of the program. United States Air Force Orbital Test Vehicle is an unmanned 5000 kg, 8.8 m-long reusable mini-spaceplane capable of autonomous re-entry and landing. The OTV-4 mission was to test Aerojet Rocketdyne's XR-5A Hall-effect thruster and conduct a NASA investigation for testing various materials in space. The mission concluded after 717 days in orbit, marking the first time X-37B landed on the Shuttle Landing Facility at the Kennedy Space Center. Location Space Launch Complex 41 Cape Canaveral, FL, USA 209 launches have been at this location. Rocket Atlas V 501 Length: 58.3 meters Diameter: 3.8 meters First Launched: April 22, 2010 Atlas V with 5m Fairing, 0 SRB, 1 Centaur upper stage engine. The Atlas V 501 rocket has been launched a total of 7 times with 7 successful and 0 failed launches. Agency United Launch Alliance Type: Commercial Abbreviation: ULA Administration: CEO: Tory Bruno Founded: 2006 Launchers: Atlas | Delta IV | Vulcan Spacecraft: CST-100 Starliner Country: USA United Launch Alliance (ULA) is a joint venture of Lockheed Martin Space Systems and Boeing Defense, Space & Security. ULA was formed in December 2006 by combining the teams at these companies which provide spacecraft launch services to the government of the United States. ULA launches from both coasts of the US. They launch their Atlas V vehicle from LC-41 in Cape Canaveral and LC-3E at Vandeberg. Their Delta IV launches from LC-37 at Cape Canaveral and LC-6 at Vandenberg. View Rocket Launch Schedule