By Henry A. Kissinger

...Any appearance that radical Islamic forces were responsible for a U.S. defeat would have enormous destabilizing consequences far beyond the region. How and when to leave Iraq will therefore emerge as a principal decision for the new president.

...A strategic reserve can now be created by the United States out of some of the forces currently in Iraq, with some moving to other threatened areas and others returning to the United States. American deployment is transformed from abdication into part of a geopolitical design.

...Establishing a deadline is the surest way to undermine the hopeful prospects. It will encourage largely defeated internal groups to go underground until a world more congenial to their survival arises with the departure of American forces. Al-Qaeda will have a deadline against which to plan a full-scale resumption of operations. And it will give Iran an incentive to strengthen its supporters in the Shiite community for the period after the American withdrawal. Establishing a fixed deadline would also dissipate assets needed for the diplomatic endgame.

...The inherent contradictions of the proposed withdrawal schedule compound the difficulties. Under the fixed withdrawal scheme, combat troops are to be withdrawn, but sufficient forces would remain to protect the U.S. Embassy, fight a resumption of al-Qaeda and contribute to defense against outside intervention. But such tasks require combat, not support, forces, and the foreseeable controversy about the elusive distinction will distract from the overall diplomatic goal. Nor is withdrawal from Iraq necessary to free forces for operations in Afghanistan.

...In a positive gesture, leading advocates of a fixed deadline, including Sen. Barack Obama, have recently put forward the idea that both withdrawal and the residual force will be condition-based. But if that is the case, why establish a deadline at all? It would suggest shifting the debate to the conditions for withdrawal rather than its timing. These considerations explain Iraqi Prime Minister Nouri al-Maliki's conduct on the occasion of Obama's visit to Iraq.

...The American presence in Iraq should not be presented as open-ended; this would not be supported by either Iraqi or American domestic opinion. But neither should it be put forward in terms of rigid deadlines. Striking this balance is a way for our country to come together as a constructive outcome emerges. Thirty years ago, Congress cut off aid to Vietnam and Cambodia two years after American troops had been withdrawn and local forces were still desperate to resist. Domestic divisions had overcome all other considerations. We must not repeat the tragedy that followed.

The next president has a great opportunity to stabilize Iraq and lay the basis for a decisive turn in the war against jihadist radicalism and for a more peaceful Middle East. Surely he will want to assess the situation on the ground before setting a strategy for his term. He should not be limited by rigid prescriptions to vindicate maxims of the past, no matter how plausible they once seemed. Withdrawal is a means; the end is a more peaceful and hopeful world.

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