Stock Photo - NASA astronaut Michael Barratt (second left), STS-133 mission specialist; Russian cosmonaut Alexander Skvortsov (second right), Expedition 23 flight engineer and Expedition 24 commander; NASA astronaut Tracy Caldwell Dyson and Russian cosmonaut Mikhail Kornienko, both Expedition 2324 flight engineers, participate in a training session in an International Space Station mock-uptrainer in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center.

Stock Photo: NASA astronaut Michael Barratt (second left), STS-133 mission specialist; Russian cosmonaut Alexander Skvortsov (second right).

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