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The STS-126 patch represents Space Shuttle Endeavour on its mission to help complete the assembly of the International Space Station. Image: NASA

The STS-126 crew members take a break during a training session for a portrait with their crew logo in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center. Image: NASA

Astronauts Sandra H. Magnus (foreground), Expedition 18 flight engineer; Robert S. (Shane) Kimbrough and Heidemarie M. Stefanyshyn-Piper, both STS-126 mission specialists, give a "thumbs-up" signal during a training session in one of the full-scale trainers in the Space Vehicle Mockup Facility at Johnson Space Center. Image: NASA

Astronaut Steve Bowen, STS-126 mission specialist, participates in an Extravehicular Mobility Unit (EMU) spacesuit fit check in the Space Station Airlock Test Article (SSATA) in the Crew Systems Laboratory at NASA's Johnson Space Center. Image: NASA