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KENNEDY SPACE CENTER, FLA. -- Associate Administrator for NASA Space Operations William Gerstenmaier and Shuttle Program Manager Wayne Hale examine the thermal protection system on the wing of space shuttle Discovery after its landing at NASA's Kennedy Space Center. Discovery 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