[IMG]http://d.yimg.com/a/p/afp/20100513/capt.p***o_1273765566765-2-0.jpg?x=93&y=130&q=85&sig=8hW9dCUBcK1lhCe7sxVb5w--[/IMG]AFP - Afghan President Hamid Karzai Thursday paid poignant tribute to US troops killed in his nation's war, walking through "the saddest acre in America" in the main US military cemetery.
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