Michael Griffin NASA Assistant Administrator for Public Affairs David Mould and NASA Space Shuttle Manager Wayne Hale watch STS.

(left to right) NASA Administrator Michael Griffin, NASA Assistant Administrator for Public Affairs David Mould and NASA Space Shuttle Manager Wayne Hale watch as the space shuttle Discovery comes in for landing at NASA's Kennedy Space Center, Fla., completing the 15-day STS-120 mission to the International Space Station. Discovery landed at 1:01pm EST Wednesday after a mission that included on-orbit construction of the station with the installation of the Harmony Node 2 module and the relocation of the P6 truss. Photo Credit: 'NASA/Bill Ingalls"