An Open Letter to Joe Biden on Afghanistan

The situation in Afghanistan is dire. But it is not too late to deploy forces to stabilize it, and ultimately turn it around. We can at least avoid the worst outcome, a collapse and slaughter that would be a catastrophe for the people of Afghanistan and a strategic and moral disaster for the United States.

We know this is doable: General John Allen, who served as commander of the International Security Assistance Force from 2011 to 2013, laid out a realistic plan for salvaging the situation and avoiding the complete collapse of...