KENNEDY SPACE CENTER, FLA. - During Crew Equipment Interface Test (CEIT) at NASA’s Kennedy Space Center, STS-121 crew members inspect the docking station to become familiar with using the sockets. STS-121 is the second Return to Flight mission to the International Space Station. 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. Mission STS-121 is scheduled to launch aboard Space Shuttle Atlantis in July.