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KENNEDY SPACE CENTER, FLA. - On Launch Pad 17-B at Cape Canaveral Air Force Station, the Mobile Service Tower begins to roll back from the pad, revealing the MESSENGER (MErcury Surface, Space ENvironment, GEochemistry and Ranging) spacecraft aboard a Delta II rocket, Model 7925-H with heavy lift capability. MESSENGER is ready for liftoff on Aug. 2 at 2:16 a.m. EDT and is expected to enter Mercury orbit in March 2011. MESSENGER was built for NASA by the Johns Hopkins University Applied Physics Laboratory in Laurel, Md.