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KENNEDY SPACE CENTER, FLA. -- At center, STS-120 Commander Pamela Melroy begins a checkout of space shuttle Discovery. With her are, from left, Shuttle Program Manager Wayne Hale, Associate Administrator for NASA Space Operations William Gerstenmaier and NASA Administrator Mike Griffin. On the right is Rebecca Griffin, wife of the administrator. Melroy and the Discovery crew completed the 15-day mission STS-120, with an on-time landing at 1:01:16 p.m. Wheel stop was at 1:02:07 p.m. Mission elapsed time was 15 days, 2 hours, 24 minutes and 2 seconds. Mission STS-120 continued the construction of the station with the installation of the Harmony Node 2 module and the relocation of the P6 truss. Photo credit: NASA/Kim Shiflett