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KENNEDY SPACE CENTER, FLA. - STS-114 Mission Specialist Andrew Thomas is helped by the Closeout Crew with his launch and entry suit before entering Space Shuttle Discovery. The Return to Flight mission to the International Space Station carries the External Stowage Platform-2, equipped with spare part assemblies, and a replacement Control Moment Gyroscope contained in the Lightweight Multi-Purpose Experiment Support Structure and Multi-Purpose Logistics Module Raffaello, housing 15 tons of hardware and supplies that will be transferred to the Station after the Shuttle docks to the complex . On this mission, the crew will perform inspections on-orbit for the first time of all of the Reinforced Carbon-Carbon (RCC) panels on the leading edge of the wings and the Thermal Protection System tiles using the new Canadian-built Orbiter Boom Sensor System and the data from 176 impact and temperature sensors. Mission Specialists will also practice repair techniques on RCC and tile samples during a spacewalk in the payload bay.