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KENNEDY SPACE CENTER, FLA. - For the second time in two days, the STS-121 crew walks out of the Operations and Checkout Building on their way to Launch Pad 39B and launch of Space Shuttle Discovery. On the left, front to back, are Pilot Mark Kelly and Mission Specialists Lisa Nowak, Stephanie Wilson and Thomas Reiter, who represents the European Space Agency. On the right, front to back, are Commander Steven Lindsey and Mission Specialists Michael Fossum and Piers Sellers. The first launch attempt July 1 was scrubbed due to weather concerns and postponed 24 hours. The launch is the 115th shuttle flight and the 18th U.S. flight to the International Space Station. During the 12-day mission, the STS-121 crew will test new equipment and procedures to improve shuttle safety, as well as deliver supplies and make repairs to the International Space Station. Photo credit: NASA/Kim Shiflett