The prime and backup crewmembers pose for pictures in front of the engines of the Soyuz booster the prime crew will ride to orbit.

At the Baikonur Cosmodrome in Kazakhstan, the Expedition 53-54 prime and backup crewmembers pose for pictures Sept. 7 in front of the first stage engines of the Soyuz booster the prime crew will ride to orbit. From left to right are Joe Acaba of NASA, Alexander Misurkin of Roscosmos , Scott Tingle of NASA, Shannon Walker of NASA, Mark Vande Hei of NASA and Anton Shkaplerov of Roscosmos. Acaba, Misurkin and Vande Hei will launch Sept. 13 on the Soyuz MS-06 spacecraft for a five and a half month mission on the International Space Station. Credit: Gagarin Cosmonaut Training Center/Irina Peshkova