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KENNEDY SPACE CENTER, FLA. - - In the RLV Hangar at KSC, examining a piece of debris from Space Shuttle Columbia are former payload specialist Dr. Roger Crouch (left), Shuttle Launch Director Mike Leinbach (right, pointing) and NASA Chief of Staff and White House liaison Courtney Stadd (right). The debris is one of more than 35,000 pieces collected so far. More than 1,218 pieces have been identified. The search of more than 500,000 acres of primary recovery area for Columbia material has passed the halfway mark. To date about 28 percent of Columbia, by weight, has been delivered to the hangar.