U.S. withdrawal could affect Iraq's internal security and stability, which could, in turn, affect U.S. strategic interests and the safety of U.S. troops and civilians in Iraq. U.S. policy-makers need a dynamic analytic framework with which to examine the shifting motivations and capabilities of the actors that affect Iraq's security. To help achieve U.S. goals in Iraq, long-term U.S.-Iraq military cooperation should have three missions: building security force capability, enhancing its professional character, and building confidence between Iraqi state and Kurdish regional forces. Within this framework, the United States should be able to contribute to continued strengthening of the internal security and stability of Iraq even as it withdraws its forces.