Part of the Human Exploration and Operations Mission Directorate, NASA’s Commercial Space Transportation program and the Commercial Crew Program is a partnership between NASA and industry to develop and fly human space transportation systems. In addition, NASA works with industry to send cargo, experiments, and supplies to the International Space Station (ISS).  This partnership with the aerospace industry to provide transportation services to and from low-Earth orbit allows NASA to focus on building spacecraft and rockets for deep space missions.  In the meantime, NASA is relying on Russia’s Soyuz spacecraft to transport U.S. astronauts to the space station. It is an expensive arrangement: in 2015, NASA extended its current contract with Russia at a cost of $490 million.