The STS-121 crew stands for a photo in front of the Vehicle Assembly Building after a media conference.

The STS-121 crew stands for a photo in front of the Vehicle Assembly Building after a media conference. From left are Mission Specialist Piers Sellers, Pilot Mark Kelly, Mission Specialists Stephanie Wilson and Lisa Nowak, Commander Steven Lindsey and Mission Specialist Michael Fossum. The remaining member of the crew, not pictured, is Mission Specialist Thomas Reiter. The crew is at NASA Kennedy Space Center for the crew equipment interface test, which provides hands-on experiences with equipment used on-orbit. The launch of STS-121, the second return-to-flight mission, is scheduled for May. Photo credit: NASA/Kim Shiflett