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In this image released by the US Air Force, the Air Force's X-37B Orbital Test Vehicle mission 4 lands at NASA 's Kennedy Space Center Shuttle Landing Facility in Florida, on May 7, 2017. Managed by the Air Force Rapid Capabilities Office, the X-37B program is the newest and most advanced re-entry spacecraft that performs risk reduction, experimentation and concept of operations development for reusable space vehicle technologies. / AFP PHOTO / US AIR FORCE / HO / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / US AIR FORCE" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS