** FILE ** Richard C. Holbrooke (left), the U.S. envoy to Afghanistan and Pakistan meets with Afghan President Hamid Karzai in February 2009 as tensions over civilian casualties strain relations between the two countries. (Associated Press)

** FILE ** Richard C. Holbrooke (left), the U.S. envoy to Afghanistan and Pakistan meets with Afghan President Hamid Karzai in February 2009 as tensions over civilian casualties strain relations between the two countries. (Associated Press)