** ADVANCE FOR WEEKEND EDITIONS, SEPT. 20-21 ** The Marlene Green freighter leaves Lake St. Clair and heads into the St.. Clair River, the border between the United States and Canada, during a tour with the Great Lakes Air and Marine Banch of the U.S. Customs and Border Protection Thursday, Aug. 7, 2008, in Harrison Township, Mich. The Great Lakes Air and Marine Branch is the fifth and final branch of the Northern Boarder Air Wing. (AP Photo/Duane Burleson)

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