Assertion: ship's crew | /r/HasProperty | dragon
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text: SpaceX has flown 20 cargo resupply missions to the International Space Station (ISS) under a partnership with NASA, as well as an uncrewed demonstration flight of the human-rated Dragon 2 spacecraft (Crew Dragon Demo-1) on March 2, 2019, and the first crewed Dragon 2 flight on May 30, 2020.