Stock Photo - Astronaut William S. McArthur, Jr. (right), Expedition 12 commander and NASA Space Station science officer; and cosmonaut Valery I. Tokarev (left), Station flight engineer representing Russia's Federal Space Agency, participate in a training session in the Quest Airlock mockuptrainer at Johnson Space Center's (JSC) Space Vehicle Mockup Facility. McArthur and Tokarev are wearing training versions of the Extravehicular Mobility Unit (EMU) space suit. European Space Agency (ESA) Astronaut Thomas Reiter of Germany assisted the crewmembers.

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