The STS-121 crew awaits the start of an emergency egress training session. From left are: mission commander Steven Lindsey; shuttle pilot Mark Kelly; and mission specialists Lisa Nowak, Michael Fossum and Piers Sellers. Not pictured are mission specialist Stephanie Wilson and ESA astronaut Thomas Reiter, which STS-121 will ferry to the ISS. Credit: NASA/JSC. Click to enlarge.
