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Show of hands: Does anybody really understand the U.S. policy in Afghanistan? Can anyone figure out how we're supposed to stay the course and bring home the troops at the same time?

I'm at a loss, even after President Obama's surprise trip to the war zone. The president's televised address from Bagram air base raised more questions than it answered. Let's start with the big one: Why?

According to Obama, "The United States and our allies went to war to make sure that al-Qaida could never use this country to launch attacks against us." I would argue that U.S. and NATO forces have already done all that is humanly possible toward that end.

The Taliban government was deposed and routed. Al-Qaida was first dislodged and then decimated, with "over 20 of their top 30 leaders" killed, according to the president. Osama bin Laden was tracked to his lair in Pakistan, shot dead and buried at sea. To the extent that al-Qaida still poses a threat, it comes from affiliate organizations in places such as Yemen and from the spread of poisonous jihadist ideology. Al-Qaida's once-extensive training camps in Afghanistan have long been obliterated and the group's presence in the country is minimal.

That smells like victory to me. Yet 94 American troops have lost their lives in Afghanistan so far in 2012, U.S. forces will still be engaged in combat until the end of 2014, and we are committed to an extraordinary -- and expensive -- level of involvement there until 2024. Why?

Of the U.S. troops who died this year as a result of hostile fire -- as opposed to accidents, illnesses or suicide -- at least one of every seven was killed not by the Taliban but by ostensibly friendly Afghan security forces.

A report, now classified, commissioned by the Pentagon last year concluded that what it called "the rapidly growing fratricide-murder trend" of attacks by Afghan soldiers and police against U.S. and allied troops reflects "the ineffectiveness in our efforts in stabilizing Afghanistan, developing a legitimate and effective government, battling the insurgency [and] gaining the loyalty, respect and friendship of the Afghans."

It should be noted that U.S. commanders in Afghanistan strongly disagree. They express confidence that the Afghan army is becoming a much more competent and professional fighting force. But they acknowledge that the process requires time and a continuing commitment of troops and funding.

By the end of 2014, Obama said, "the Afghans will be fully responsible for the security of their country." But how many Americans will remain? And, again, why?

At that point, Obama said, we will leave behind just enough personnel to support the Afghan government in counterterrorism operations and provide continued training for Afghan forces. At present, however, we're in the midst of a counterinsurgency campaign of the kind that takes decades, at best, to succeed. If we're going to switch to counterterrorism in a couple of years, why not just make the switch now?

The United States has agreed to support Afghanistan's social and economic development and its security institutions through 2024. Does this sound like nation-building to you? Because that's what it sounds like to me.

"Tonight, I'd like to tell you how we will complete our mission and end the war in Afghanistan," Obama said Tuesday. We're still waiting.