FILE - U.S. Air Force bombs create a curtain of flying shrapnel and debris barely 200 feet beyond the perimeter of South Vietnamese ranger positions defending Khe Sanh during the siege of the U.S. Marine base, March 1968. (AP Photo/ARVN, Maj. Nguyen Ngoc Hanh, File)

Associated Press
FILE - U.S. Air Force bombs create a curtain of flying shrapnel and debris barely 200 feet beyond the perimeter of South Vietnamese ranger positions defending Khe Sanh during the siege of the U.S. Marine base, March 1968. (AP Photo/ARVN, Maj. Nguyen Ngoc Hanh, File)
FILE - U.S. Air Force bombs create a curtain of flying shrapnel and debris barely 200 feet beyond the perimeter of South Vietnamese ranger positions defending Khe Sanh during the siege of the U.S. Marine base, March 1968. (AP Photo/ARVN, Maj. Nguyen Ngoc Hanh, File)
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