Secret Air Force plane lands after 2 years in space

The Air Force's X-37B Orbital Test Vehicle mission 4 landed at NASA 's Kennedy Space Center Shuttle Landing Facility May 7, 2017. (U.S. Air Force)
An unpiloted military space plane, launched by an Atlas 5 rocket in May 2015, glided to an unannounced landing on the long shuttle runway at the Kennedy Space Center on Sunday, closing out a 718-day mission. It was the first Florida landing of a returning spacecraft since Atlantis flew home in the program’s final mission in 2011.The #AirForce #