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In page Donald Pettit:

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On May 25, 2012, Pettit and Kuipers operated the Canadarm2 to grapple the SpaceX Dragon and berth it to the Harmony module.[4] Pettit was the first to enter the unmanned supply ship on May 26, making him the first astronaut in the history of space exploration to successfully enter a commercially-built and operated spacecraft berthed to the ISS in orbit.