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KENNEDY SPACE CENTER, FLA. - Following rollback of the Rotating Service Structure, the orbiter access arm is able to be extended to Space Shuttle Discovery. The arm provides access into Discovery through the White Room, where the astronauts are checked by the closeout crew. Behind Discovery is the orange External Tank, flanked by the twin white Solid Rocket Boosters. Discovery is scheduled to launch on the historic Return to Flight mission STS-114 at 3:51 p.m. July 13 with a crew of seven. The payload includes the External Stowage Platform-2, equipped with spare part assemblies, and a rep…