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KENNEDY SPACE CENTER, FLA. - In the Space Station Processing Facility at NASA Kennedy Space Center, STS-121 Mission Specialists Michael Fossum (left above) and Piers Sellers (on ground) get a close look at the replacement trailing umbilical system reel assembly that will be installed on the International Space Station. They and other crew members -- Commander Steven Lindsey, Pilot Mark Kelly and Mission Specialists Lisa Nowak and Stephanie Wilson -- are at Kennedy to take part in the crew equipment interface test (CEIT). The CEIT provides hands-on experiences with equipment used on-orbit. Mission STS-121 is the second in the Return to Flight sequence and will carry on improvements that debuted during last year's STS-114 mission and build upon those tests. Launch is scheduled in May. Photo credit: NASA/Kim Shiflett