NASA Assigns Astronauts to Agency’s SpaceX Crew-4 Mission to Space Station NASA has assigned two crew members to launch on the agency’s SpaceX Crew-4 mission - the fourth crew rotation flight of the Crew Dragon spacecraft to the International Space Station. http://www.nasa.gov/press-release/nasa-assigns-astronauts-to-agency-s-spacex-crew-4-mission-to-space-station