The Cold War nuclear threat may have subsided with the collapse of the Soviet Union, but The Long War, our campaign to secure the U.S. and our national interests and allies against Islamist terror, is heating up. Also on the rise is the risk of nuclear attack on Western targets. Albeit limited in scope, such attacks are much more probable now than during the Cold War. Preventing nuclear attack is more difficult today because our Jihadi foes are asymmetric rather than symmetric entities. For most of U.S. history, perilous national security threats were symmetric, emanating from distinct nation-states or alliances...