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KENNEDY SPACE CENTER, FLA. - A Solid Rocket Booster (SRB) arrives at Pad 17-B, Cape Canaveral Air Force Station. It is the first SRB that will be mated to the Boeing Delta II Heavy rocket for the MESSENGER spacecraft launch. Scheduled to lift off Aug. 2, bound for Mercury, the spacecraft is expected to reach orbit around Mercury in March 2011. MESSENGER was built for NASA by the Johns Hopkins University Applied Physics Laboratory in Laurel, Md.