Stock Photo - NASA Administrator Mike Griffin and his wife Rebecca Griffin (left) greet astronaut Pam Melroy, STS-120 commander, at NASA's Kennedy Space Center. Behind Griffin is Associate Administrator for NASA Space Operations William Gerstenmaier. Melroy and the Space Shuttle Discovery crew completed the 15-day STS-120 mission, with an on-time landing at 1:01:16 p.m. (EST). Wheel stop was at 1:02:07 p.m. Mission elapsed time was 15 days, 2 hours, 24 minutes and 2 seconds. The STS-120 crew continued the construction of the station with the installation of the Harmony Node 2 module and the relocation of the P6 truss.