STS-121 Space Shuttle Processing Update

NASA Administrator Michael Griffin, second from left, and Associate Administrator for Space Operations William Gerstenmaier, right, look on as Space Shuttle Program Manager Wayne Hale speaks from NASA's Marshall Space Flight Center during a media briefing about the space shuttle program and processing for the STS-121 mission, Friday, April 28, 2006, at NASA Headquarters in Washington. Moderator Dean Acosta looks on af far left. Photo Credit (NASA/Bill Ingalls)