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Next on the NASA Space Shuttle Status Report: Space Shuttle Discovery roared into space and successfully completed a 12-day Return to Flight mission after more than two years of safety modifications. On August 9, Discovery glided to a picture-perfect, pre-dawn landing at Edwards Air Force Base in California, concluding its 5.8-million-mile journey. Now with focus set on another launch in spring 2006, all three of NASA's orbiters are currently preparing for missions to the International Space Station. The NASA Space Shuttle Status Report starts right now. After a successful mission to deliver much-needed supplies to the International Space Station, Space Shuttle Discovery is once again called upon to soar into space. I'm Stephen Payne, NASA test director, and this is the NASA Space Shuttle Status Report. In Orbiter Processing Facility Bay 3, work has picked up once again on Discovery in preparation for NASA's second test mission, STS-121. Discovery will be used for the next mission instead of Atlantis. Atlantis is needed to carry Space Station truss segments on STS-115 which are too heavy to be carried by Discovery. Since landing, Discovery's orbiter boom sensor system, or OBSS, has