ISS014-E-19539 (17 April 2007) --- The crewmembers onboard the International Space Station enjoy a light moment as they pose for a group portrait during the ceremony of Changing-of-Command from Expedition 14 to Expedition 15 in the Destiny laboratory. From the left are cosmonaut Mikhail Tyurin, Expedition 14 flight engineer; astronaut Michael E. Lopez-Alegria, Expedition 14 commander and NASA space station science officer; astronaut Sunita L. Williams, Expedition 14/15 flight engineer; cosmonauts Fyodor N. Yurchikhin, Expedition 15 commander; and Oleg V. Kotov, Expedition 15 flight engineer. Tyurin, Yurchikhin and Kotov represent Russia's Federal Space Agency.