McChrystal’s War Gen. Stanley A. McChrystal believes he can win in Afghanistan. It's the rest of the world that needs convincing.

By Evan Thomas

In Kabul, the entrance to the headquarters of the International Security Assistance Force—the coalition of NATO and U.S. forces in Afghanistan—is easy to miss. Ever since the Taliban blew up the main gate a month ago, visitors have been required to pass through a small metal door and down winding, dingy passageways topped with barbed wire. Inside the ISAF compound, grimy trailers, used to provide office space, are stacked up around a seedy, once grand building that was long ago a social club for officers of the British Empire. There was a bar, but a couple of weeks ago, Gen. Stanley McChrystal outlawed alcohol on the base, and he has indicated that he wants to turn a small, pretty garden, a tiny oasis of green, into a rifle range.

McChrystal, 55, is a purebred warrior, the son of a two-star general, West Point class of '76, a former commander of the elite Rangers Regiment, and, from 2003 to 2008, the head of hunter-killer black ops in Special Operations. He eats one meal a day, works out obsessively every morning at 5, and is so free of body fat that he looks gaunt. Lately, as commander of the war in Afghanistan, he has become a kind of Zen warrior, preaching that often "the shot you don't fire is more important than the one you do." He is a student of what he calls "counterinsurgency math." If you encounter 10 Taliban members and kill two, he says, you don't have eight remaining enemies. You have more like 20: the friends and relatives of the two you killed. ....