 Once aboard the station, they joined Garrett Reisman, who transferred from Expedition 16 to join the Expedition 17 crew.Reisman was replaced by Gregory Chamitoff, who launched aboard the Space Shuttle "Discovery" mission STS-124 on 31 May 2008.Volkov and Kononenko landed safely on 24 October 2008, while Chamitoff remained aboard the station as an Expedition 18 crewmember.