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The Expedition 56 crew members pose for a portrait in the International Space Station's Harmony module. Clockwise from top are Expedition 56 Flight Engineers Serena Auñón-Chancellor, Oleg Artemyev, Sergey Prokopyev and Ricky Arnold. Auñón-Chancellor and Arnold represent NASA while Artemyev and Prokopyev represent Roscosmos. In the center, from left, are ESA (European Space Agency) astronaut Alexander Gerst and Expedition 56 Commander Drew Feustel of NASA. Gerst will become commander of Expedition 57 when Feustel, Arnold and Artemyev depart the space station in October.