Millions of Americans grew up fearing nuclear attack from the Soviet Union. We practiced taking cover under our school desks, and learned the location of the nearest air raid shelter. We watched anxiously as the Cuban missile crisis unfolded. Our nation and world survived under the shadow of Mutually Assured Destruction (MAD). But now we find ourselves in a different world – one that includes Iran, rogue nations, clandestine terrorist groups and the ongoing threat of human error.