In October 2001, George W. Bush told the country he was sending the American military to Afghanistan in order to “bring justice to our enemies.” It’s safe to say support for the war would not have been as nearly unanimous as it was had he said, “Oh, and by the way, our troops are going to be fighting there for the next 13 years.” But if all goes according to plan and Barack Obama follows up on his pledge to bring them home by the end of 2014, that’s how long the Afghanistan war will have lasted.