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KENNEDY SPACE CENTER, FLA. - STS-121 Mission Specialist Michael Fossum is helped with the communication device he wears under his helmet during suitup for launch today on Space Shuttle Discovery. 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