KENNEDY SPACE CENTER, FLA. - In Orbiter Processing Facility bay 1, United Space Alliance technicians help STS-121 Mission Commander Steven W. Lindsey (right) and Pilot Mark E. Kelly with an inspection of the windows in Atlantis' cockpit. The STS-121 crew is at KSC to participate in the Crew Equipment Interface Test (CEIT). During CEIT, the crew has an opportunity to get a hands-on look at the orbiter and equipment they will be working with on their mission. STS-121, the second Return to Flight mission, is scheduled to launch aboard Atlantis in July.