Prime Expedition 53 54 crewmember and NASA astronaut Joe Acaba lays flowers at the Kremlin Wall in Moscow.

Prime Expedition 53-54 crewmember and NASA astronaut Joe Acaba lays flowers at the Kremlin Wall in Moscow where Russian space icons are interred as part of traditional pre-launch ceremonies Sept. 1. Acaba, Mark Vande Hei of NASA and Alexander Misurkin of Roscosmos will launch Sept. 13 from the Baikonur Cosmodrome in Kazakhstan Sept. 13 on the Soyuz MS-06 spacecraft for a five and a half month mission on the International Space Station. Credit: NASA/Elizabeth Weissinger