The new space plane built by Boeing is expected to return to earth in the coming days after completing its first mission. But few people know what that mission was. The X-37B Orbital Test Vehicle (OTV) was built solely for use by the U.S. military, and could potentially be used for satellite jamming and kinetic attacks. But it may be used mostly for intelligence purposes, including gathering information on enemy space systems. China’s state-controlled media has reported that the X-37B may have been spying on China’s space station.