Mike Williams arranges weights atop a freshly installed section of tile on the right wing of Endeavour at NASA's Kennedy Space Center.

Mike Williams, a thermal protection system technician with United Space Alliance, arranges weights atop a freshly installed section of tile on the right wing of space shuttle Endeavour at NASA's Kennedy Space Center in Florida. The weights will hold the section in place while the adhesive hardens beneath.

Ongoing transition and retirement activities are preparing the spacecraft for public display at the California Science Center in Los Angeles. Endeavour flew 25 missions during its 19-year career. Photo credit: NASA/Cory Huston