Astronauts aboard the International Space Station (ISS) are always thrilled to welcome new crew members to the orbiting laboratory. However, the May 31, 2020, arrival of NASA astronauts Robert Behnken and Douglas Hurley on SpaceX's Endeavour was particularly exciting. It was the first piloted launch from American soil since the US Space Shuttle program was retired in 2011 and the first human spaceflight performed by a public-private partnership — NASA and SpaceX.