STS-121 Commander Steven Lindsey adjusts his glove as he dons his launch and entry suit for launch on Space Shuttle Discovery.

STS-121 Commander Steven Lindsey adjusts his glove as he dons his launch and entry suit for launch today on Space Shuttle Discovery. Lindsey is making his fourth space flight. 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. Photo credit: NASA/Kim Shiflett