John Allen, Co-Director, Center for 21stCentury Security and Intelligence, The Brookings Institution

General John R. Allen is the Co-Director of the Brookings Center for 21st Century Security and Intelligence. He is a retired four-star general who served as the Commander of the NATO International Security Assistance Force and the Commander of U.S. Forces Afghanistan from 2011 to 2013. He is the first Marine in history to command a theater of war. ...