Stock Photo - NASA astronauts Steve Lindsey (left), STS-133 commander; and Doug Wheelock, Expedition 24 flight engineer and Expedition 25 commander, participate in a training session in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center. Flight director Brian T. Smith is at right.

Stock Photo: NASA astronauts Steve Lindsey (left), STS-133 commander; and Doug Wheelock, Expedition 24 flight engineer and Expedition 25 commander.

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