Mission Specialist Leland Melvin signals his readiness for the launch of Atlantis while he dons the launch and entry suit.

Mission Specialist Leland Melvin signals his readiness for the launch of space shuttle Atlantis on the STS-122 mission while he dons the launch and entry suit. The launch, scheduled for 2:45 p.m. EST, will be the third attempt for Atlantis since December 2007 to carry the European Space Agency's Columbus laboratory to the International Space Station. During the 11-day mission, the crew's prime objective is to attach the laboratory to the Harmony module, adding to the station's size and capabilities. Photo credit: NASA/Kim Shiflett