The three phases of American involvement in Afghanistan had a common point: All three were heavily dependent on non-U.S. forces to do the heavy lifting. In the first phase, the mujahideen performed this task. In the second phase, the United States relied on Pakistan to manage Afghanistan's civil war. In the third phase, especially in the beginning, the United States depended on Afghan forces to fight the Taliban. Later, when greater numbers of American and allied forces arrived, the United States had limited objectives beyond preserving the Afghan government and engaging al Qaeda wherever it might be found (and in any event, by 2003, Iraq had taken priority over Afghanistan). In no case did the Americans use their main force to achieve their goals.

The Fourth Phase of the Afghan War

The fourth phase of the war began in 2009, when U.S. President Barack Obama decided to pursue a more aggressive strategy in Afghanistan. Though the Bush administration had toyed with this idea, it was Obama who implemented it fully. During the 2008 election campaign, Obama asserted that he would pay greater attention to Afghanistan. The Obama administration began with the premise that while the Iraq War was a mistake, the Afghan War had to be prosecuted. It reasoned that unlike Iraq, which had a tenuous connection to al Qaeda at best, Afghanistan was the group's original base. He argued that Afghanistan therefore should be the focus of U.S. military operations. In doing so, he shifted a strategy that had been in place for 30 years by making U.S. forces the main combatants in the war. Though Obama's goals were not altogether clear, they might be stated as follows:

Deny al Qaeda a base in Afghanistan.

Create an exit strategy from Afghanistan similar to the one in Iraq by creating the conditions for negotiating with the Taliban; make denying al Qaeda a base a condition for the resulting ruling coalition.

Begin withdrawal by 2011. To do this, there would be three steps.

Create Afghan security forces under the current government to take over from the Americans.

Increase pressure on the Taliban by driving a wedge between them and the population and creating intra-insurgent rifts via effective counterinsurgency tactics.

In analyzing this strategy, there is an obvious issue: While al Qaeda was based in Afghanistan in 2001, Afghanistan is no longer its primary base of operations. The group has shifted to Pakistan, Somalia and other countries. As al Qaeda is thus not dependent on any one country for its operational base, denying it bases in Afghanistan does not address the reality of its dispersion. Securing Afghanistan, in other words, is no longer the solution to al Qaeda.

Obviously, Obama's planners fully understood this. Therefore, sanctuary denial for al Qaeda had to be, at best, a secondary strategic goal. The primary strategic goal was to create an exit strategy for the United States based on a negotiated settlement with the Taliban and a resulting coalition government. The al Qaeda issue depended on this settlement, but could never be guaranteed. In fact, neither the long-term survival of a coalition government nor the Taliban policing al Qaeda could be guaranteed.

The exit of U.S. forces represents a bid to reinstate the American strategy of the past 30 years, namely, having Afghan forces reassume the primary burden of fighting. The creation of an Afghan military is not the key to this strategy. Afghans fight for their clans and ethnic groups. The United States is trying to invent a national army where no nation exists, a task that assumes the primary loyalty of Afghans will shift from their clans to a national government, an unlikely proposition.

The Real U.S. Strategy

Rather than trying to strengthen the Karzai government, the real strategy is to return to the historical principles of U.S. involvement in Afghanistan: alliance with indigenous forces. These indigenous forces would pursue strategies in the American interest for their own reasons, or because they are paid, and would be strong enough to stand up to the Taliban in a coalition. As CIA Director Leon Panetta put it this weekend, however, this is proving harder to do than expected.

The American strategy is, therefore, to maintain a sufficient force to shape the political evolution on the ground, and to use that force to motivate and intimidate while also using economic incentives to draw together a coalition in the countryside. Operations like those in Helmand province< — where even Washington acknowledges that progress has been elusive and slower than anticipated — clearly are designed to try to draw regional forces into regional coalitions that eventually can enter a coalition with the Taliban without immediately being overwhelmed. If this strategy proceeds, the Taliban in theory will be spurred to negotiate out of concern that this process eventually could leave it marginalized.

There is an anomaly in this strategy, however. Where the United States previously had devolved operational responsibility to allied groups, or simply hunkered down, this strategy tries to return to devolved responsibilities by first surging U.S. operations. The fourth phase actually increases U.S. operational responsibility in order to reduce it. From the grand strategic point of view, the United States needs to withdraw from Afghanistan, a landlocked country where U.S. forces are dependent on tortuous supply lines. Whatever Afghanistan's vast mineral riches, mining them in the midst of war is not going to happen. More important, the United States is overcommitted in the region and lacks a strategic reserve of ground forces. Afghanistan ultimately is not strategically essential, and this is why the United States has not historically used its own forces there.

Obama's attempt to return to that track after first increasing U.S. forces to set the stage for the political settlement that will allow a U.S. withdrawal is hampered by the need to begin terminating the operation by 2011 (although there is no fixed termination date). It will be difficult to draw coalition partners into local structures when the foundation — U.S. protection — is withdrawing. Strengthening local forces by 2011 will be difficult. Moreover, the Taliban's motivation to enter into talks is limited by the early withdrawal. At the same time, with no ground combat strategic reserve, the United States is vulnerable elsewhere in the world, and the longer the Afghan drawdown takes, the more vulnerable it becomes (hence the 2011 deadline in Obama's war plan).

In sum, this is the quandary inherent in the strategy: It is necessary to withdraw as early as possible, but early withdrawal undermines both coalition building and negotiations. The recruitment and use of indigenous Afghan forces must move extremely rapidly to hit the deadline (though officially on track quantitatively, there are serious questions about qualitative measures) — hence, the aggressive operations that have been mounted over recent months. But the correlation of forces is such that the United States probably will not be able to impose an acceptable political reality in the time frame available. Thus, Afghan President Hamid Karzai is said to be opening channels directly to the Taliban, while the Pakistanis are increasing their presence. Where a vacuum is created, regardless of how much activity there is, someone will fill it.

Therefore, the problem is to define how important Afghanistan is to American global strategy, bearing in mind that the forces absorbed in Iraq and Afghanistan have left the United States vulnerable elsewhere in the world. The current strategy defines the Islamic world as the focus of all U.S. military attention. But the world has rarely been so considerate as to wait until the United States is finished with one war before starting another. Though unknowns remain unknowable, a principle of warfare is to never commit all of your reserves in a battle — one should always maintain a reserve for the unexpected. Strategically, it is imperative that the United States begin to free up forces and re-establish its ground reserves.

Given the time frame the Obama administration's grand strategy imposes, and given the capabilities of the Taliban, it is difficult to see how it will all work out. But the ultimate question is about the American obsession with Afghanistan. For 30 years, the United States has been involved in a country that is virtually inaccessible for the United States. Washington has allied itself with radical Islamists, fought against radical Islamists or tried to negotiate with radical Islamists. What the United States has never tried to do is impose a political solution through the direct application of American force. This is a new and radically different phase of America's Afghan obsession. The questions are whether it will work and whether it is even worth it.