The crew of space shuttle Discovery's STS-124 mission gather for a group photo.

After their arrival at NASA Kennedy Space Center's Shuttle Landing Facility, the crew of space shuttle Discovery's STS-124 mission gather for a group photo. The crew is at Kennedy to take part in the Terminal Countdown Demonstration Test, or TCDT. From left are Mission Specialist Greg Chamitoff, Pilot Ken Ham, Mission Specialist Karen Nyberg, Commander Mark Kelly and Mission Specialists Ron Garan, Mike Fossum and Akihiko Hoshide, who represents the Japan Aerospace Exploration Agency, or JAXA. TCDT is a rehearsal for launch that includes practicing emergency procedures, handling on-orbit equipment, and simulating a launch countdown. On the STS-124 mission, the crew will deliver and install the Japanese Experiment Module – Pressurized Module and Japanese Remote Manipulator System. Discovery's launch is targeted for May 31. Photo credit: NASA/Kim Shiflett