The landing of an unmanned military space plane at Kennedy Space Center Sunday morning concluded an almost two-year mission in orbit, according to the U.S. Air Force. The Air Force tweeted shortly after 8 a.m. that the reusable X-37B Orbital Test Vehicle had landed safely, completing its fourth classified mission. OTV-4 launched from Cape Canaveral on a

United Launch Alliance Atlas V rocket on May 20, 2015. Air Force officials have called the X-37B program, which is managed by the Air Force Rapid Capabilities Office, “the newest and most advanced re-entry spacecraft.” The Air Force’s two mini-shuttles have completed two missions each since the first launch from the Cape in 2010. Three prior X-37B landings occurred at Vandenberg Air Force Base in California. READ MORE