STS 120 Commander Pamela Melroy is greeted by NASA Administrator Mike Griffin.

STS-120 Commander Pamela Melroy is greeted by NASA Administrator Mike Griffin. His wife, Rebecca Griffin, is at his side. Behind Griffin is Associate Administrator for NASA Space Operations William Gerstenmaier. 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