NEW : `` Proof is in the pudding '' on Afghans reform promises , Hillary Clinton says . `` We will try our best '' to be ready to take over security in this week , ABC says . President Obama has said Afghanistan troops will start leaving U.S. in 2011 . Afghan President Hamid Karzai said Sunday the United States and its allies must have patience if his country is not ready to assume control of its own security by July 2011 , when U.S. troops would begin leaving under President Obama 's plan . Afghan president says Obama timeline is a goal , not `` an exit announcement ''
NEW : `` Proof is in the pudding '' on Afghans reform promises , Hillary Clinton says . `` We will try our best '' to be ready to take over security in this week , ABC says . President Obama has said Afghanistan troops will start leaving U.S. in 2011 . Afghan president says Obama timeline is a goal , not `` an exit announcement ''