Following the recent endorsement of the U.S.-Afghanistan bilateral security agreement by Afghanistan's Loya Jirga, a new CFR report outlines the composition, role, and rationale for the roughly ten thousand U.S. troops that will possibly remain in the country after the 2014 drawdown. The authors explain how the United States should manage the complex political, security, and economic challenges that will accompany the reduction in U.S. and allied forces. They argue for a force of eight to twelve thousand troops to assist Afghan national security forces and prevent a resurgence of al-Qaeda.