Don't fail Afghanistan -- (Iraq may be hopeless, but Afghanistan is worth defending. Here's why and how.)

The collapse of the noble nation-building experiment in Afghanistan would destroy U.S. credibility in the eyes of the world, shake global security and condemn millions of people to another generation of warfare and terrorism. And it would be all the more devastating if accompanied by U.S. defeat in Iraq. Yet the effort to build a stable nation atop the wreckage of Afghanistan can still, with great effort, be salvaged.