While future insurgencies may be inevitable, they can be marginalized. It is incumbent upon the international coalition to commit to a sustained presence in Iraq and the freed areas of Syria for years to come. This presence must include substantive improvements to security forces, reconstruction of decimated communities, and reconciliation of Sunni populations at the national level. This effort may take up to a decade, if not longer, the United States must leverage members of the coalition to the greatest extent possible, and policy makers must be made aware of the sobering timeline and costs required.