[IMG]http://d.yimg.com/a/p/afp/20100514/capt.p***o_1273767700255-7-0.jpg?x=91&y=130&q=85&sig=FSUaWIuPWp1py_FhJK2kSA--[/IMG]AFP - Afghan President Hamid Karzai paid tribute to US troops killed in his nation's war as the top NATO commander voiced cautious optimism about pushing back the Taliban.
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