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KENNEDY SPACE CENTER, FLA. -- The STS-112 crew wave to spectators as they exit the Operations and Checkout Building for their ride to Launch Pad 39B and the launch scheduled 3:46 p.m. EDT. Leading the way are Pilot Pamela Melroy and Commander Jeffrey Ashby. In the second row are Mission Specialists David Wolf (left) and Sandra Magnus. Behind them are Mission Specialists Fyodor Yurchikhin and Piers Sellers. Sellers, Magnus and Yurchikhin are making their first Shuttle flights. STS-112 is the 15th assembly flight to the International Space Station, carrying the S1 Integrated Truss Structure,…