Afghanistan's President Ashraf Ghani waves from a golf cart as he rides to a meeting at the Camp David Presidential retreat, Monday, March 23, 2015, in Camp David, Md. The pace of U.S. troop withdrawals from Afghanistan will headline Afghan President Ashraf Ghani's visit to Washington, yet America's exit from the war remains tightly hinged to the abilities of the Afghan forces that face a tough fight against insurgents this spring. (AP Photo/ Evan Vucci)
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