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NASA spacewalkers Bob Behnken and Chris Cassidy.

Cosmonaut Sergey Ryzhikov signs a wall mural.

Cosmonaut Sergey Kud-Sverchkov signs a wall mural.

NASA astronaut Kate Rubins signs a wall mural

Expedition 64 crew members tour the Baikonur Cosmodrome Museum.

Expedition 64 crew members tour the Baikonur Cosmodrome Museum.

Cosmonaut Sergey Ryzhikov is presented with a souvenir launch key.

Expedition 64 prime and backup crew members.

Expedition 64 backup crew members in front of the Soyuz MS-17.