NASA and SpaceX launch the Dragon's second six-month operational crew mission (Crew-2) to the International Space Station (ISS). Four astronauts fly aboard the Dragon spacecraft during the Crew-2 mission. Apart from two NASA astronauts, two international partners from the Japanese Aerospace Exploration Agency (JAXA) and European Space Agency (ESA) are also involved. It is the first time two Crew Dragons are attached simultaneously to the orbiting laboratory.

NASA's Commercial Crew Program has worked with several American aerospace industry companies to facilitate the development of the U.S. human spaceflight systems since 2010.