United Space Alliance technicians work on the thermal protection system tiles around the landing gear on space shuttle Discovery.

In the Orbiter Processing Facility at NASA's Kennedy Space Center, United Space Alliance technicians work on the thermal protection system tiles around the landing gear on space shuttle Discovery. The launch of Discovery on the STS-124 mission is targeted for April 24. On the mission, Discovery will transport the Kibo Japanese Experiment Module - Pressurized Module and the Japanese Remote Manipulator System to the International Space Station. Photo credit: NASA/Kim Shiflett