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NASA astronaut Steve Swanson, Expedition 39 flight engineer about to become Expedition 40 commander, signs a wall in the Quest airlock of the International Space Station after mounting his crew patch, continuing a tradition of station crew members who have participated in space walks on their respective flights. A short time later, Swanson took over command of the orbital outpost upon the departure of Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA) and Flight Engineers Mikhail Tyurin of Roscosmos and Rick Mastracchio of NASA.