Osama Bin Laden was the mastermind behind the worst terrorist attack on U.S. soil. He was killed by U.S. forces in Pakistan. For some analysis, Renee Montagne talks to counterterrorism expert David Kilcullen of the Center for a New American Security. He is also CEO of Caerus Associates and author of the books The Accidental Guerilla and Counterinsurgency.
Copyright 2011 NPR
