X-37BLoaded into an aerodynamic shroud atop an Atlas V rocket, the U.S. Air Force launches the X-37B unmanned spacecraft into Earth orbit. Originally scheduled for an October launch, the Boeing-built X-37B resembles a scaled-down Space Shuttle. Whereas this vehicle had previously stayed in space for several months in 2010 before returning, its second flight sees it remain in orbit for nearly two years, not coming in for an automated landing until October 2014. Details of the vehicle’s mission and payload remain classified; the flight is designated USA-240.