General Jack Keane (USA, Ret.), Frederick W. Kagan, and Kimberly Kagan:
Reducing our troop strength solely on the basis of trends in violence also misses the critical point that the mission of American forces in Iraq is shifting rapidly from counterinsurgency to peace enforcement. The counter-insurgency fight that characterized 2007 continues mainly in areas of northern Iraq. The ability of organized enemy groups, either Sunni or Shia, to conduct large-scale military or terrorist operations and to threaten the existence of the Iraqi government is gone for now. No area of Iraq today requires the massive, violent, and dangerous military operations that American and Iraqi forces had to conduct over the last 18 months in order to pacify various places or restore them to government control. Although enemy networks and organizations have survived and are regrouping, they will likely need considerable time to rebuild their capabilities to levels that pose more than a local challenge–and intelligent political, economic, military, and police efforts can prevent them from rebuilding at all.
American troops continue to conduct counterterrorism operations against Al Qaeda in Iraq, which has not given up, and against Iranian-backed Special Groups, which are also reconstituting. U.S. forces support Iraqi forces conducting counterinsurgency operations in the handful of areas where any significant insurgent capability remains. But mostly our troops are enforcing the peace.
In ethnically mixed areas, American troops are seen as impartial arbiters and mediators. In predominantly Shia or Sunni areas, they are seen as guarantors of continued safety, destroying the justification for illegal militias. American brigades also play critical roles in economic reconstruction, not by spending American money but by helping Iraqis spend their own money. American staffs help local Iraqi leaders develop prioritized lists of their needs, budgets to match those priorities, and plans for executing those budgets. American troops support the Provincial Reconstruction Teams that mentor Iraqi provincial leaders and help local communities communicate their needs to the central government. American soldiers provide essential support to Iraqi soldiers and police working hard to develop their ability to function on their own.
Indeed, American combat brigades have become the principal enablers of economic and political development in Iraq. When an American brigade is withdrawn from an area, there is nothing to take its place–all of these functions go unperformed. Clearly, then, the number of brigades needed in Iraq should be tied not to the level of violence but to the roles the Americans perform and the importance of those roles to the further development of Iraq as a stable and peaceful state.
[Emphasis added. –R]