FILE - In this Jan. 25, 2007 file photo, an unexploded 500 pound bomb sits upended where it originally fell, in an area littered with unexploded ordinance, in a live impact area on the former U.S. Naval Training Range on Vieques Island, Puerto Rico. The U.S. Navy departed the Puerto Rican island of Vieques on May 1, 2003 and the cleanup of the bombing range on an island the Navy once called its "crown jewel" of live-fire training is expected to take another decade. (AP Photo/Brennan Linsley, File)

Associated Press
FILE - In this Jan. 25, 2007 file photo, an unexploded 500 pound bomb sits upended where it originally fell, in an area littered with unexploded ordinance, in a live impact area on the former U.S. Naval Training Range on Vieques Island, Puerto Rico. The U.S. Navy departed the Puerto Rican island of Vieques on May 1, 2003 and the cleanup of the bombing range on an island the Navy once called its "crown jewel" of live-fire training is expected to take another decade. (AP Photo/Brennan Linsley, File)
FILE - In this Jan. 25, 2007 file photo, an unexploded 500 pound bomb sits upended where it originally fell, in an area littered with unexploded ordinance, in a live impact area on the former U.S. Naval Training Range on Vieques Island, Puerto Rico. The U.S. Navy departed the Puerto Rican island of Vieques on May 1, 2003 and the cleanup of the bombing range on an island the Navy once called its "crown jewel" of live-fire training is expected to take another decade. (AP Photo/Brennan Linsley, File)
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