KENNEDY SPACE CENTER, FLA. - In the Orbiter Processing Facility at NASA’s Kennedy Space Center, United Space Alliance technicians Terry Williams (left) and Ron Delaney examine Space Shuttle Atlantis before retracting the nose landing gear. Compression measurements will be taken of the newly installed nose landing gear thermal barrier seal with the gear in position in its wheel well and the landing gear doors closed. Atlantis is being processed for launch on the second Return to Flight mission, STS-121, which is scheduled to fly in July.