FILE - B52 high altitude bombers leave condensation trails while passing the town of Cai Lay in the Mekong Delta on Sept. 29, 1972, moments after unleashing bombs on a suspected enemy positions. (AP Photo/Nick Ut, File)

Associated Press
FILE - B52 high altitude bombers leave condensation trails while passing the town of Cai Lay in the Mekong Delta on Sept. 29, 1972, moments after unleashing bombs on a suspected enemy positions. (AP Photo/Nick Ut, File)
FILE - B52 high altitude bombers leave condensation trails while passing the town of Cai Lay in the Mekong Delta on Sept. 29, 1972, moments after unleashing bombs on a suspected enemy positions. (AP Photo/Nick Ut, File)
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