X-37BIn a launch simply designated USA-212, the U.S. Air Force launches the Boeing-built X-37B unmanned vehicle into Earth orbit. Resembling a scaled-down Space Shuttle, the X-37B is launched via an Atlas V rocket, though during launch it is fully surrounded by an aerodynamic shell rather than being side-mounted to its booster like the manned Shuttle. The X-37B does not return until December, using a landing profile similar to that of the Shuttle (but automated), and the details of the mission remain classified.