Kelly became a long-duration crewmember of ISS on October 9, 2010, after arriving on a Russian Soyuz spacecraft.[5] He arrived at the station during Expedition 25, serving as a flight engineer.[6] He took over command of the station on November 25, 2010, at the start of Expedition 26 which began officially when the spacecraft Soyuz TMA-19 undocked, carrying the previous commander of the station, Douglas H. Wheelock.[7]