Thomas Reiter is suiting up for a second launch attempt on Space Shuttle Discovery. The first launch attempt July 1 was scrubbed due to weather concerns and postponed 24 hours. Reiter represents the European Space Agency. The launch is the 115th shuttle flight and the 18th U.S. flight to the International Space Station. During the 12-day mission, the STS-121 crew will test new equipment and procedures to improve shuttle safety, as well as deliver supplies and make repairs to the International Space Station.