Marine Gen. Joseph F. Dunford, Jr., Commander, International Security Assistance Force, listens on Capitol Hill in Washington, Wednesday, March 12, 2014, while testifying before the Senate Armed Services Committee on the situation in Afghanistan. President Barack Obama has threatened to withdraw all American forces from Afghanistan if a new security agreement is not signed by the end of the year, but there is no legal reason the U.S. has to resort to the "zero option," as administration officials have repeatedly claimed. (AP Photo/Carolyn Kaster)
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