HANOI, VIET NAM – AUGUST 3: A woman cuts aquatic vegetables near the wreckage of US B-52 bombing plane shot down in 1972 on a small lake in Ngoc Ha village of Hanoi 03 August. US Secretary of State Warren Christopher is to make a two-day official visit to Hanoi this weekend, 20 years after the end of Vietnam War. AFP PHOTO (Photo credit should read HOANG DINH NA/AFP/Getty Images)