It was cognitive warfare on the offense, it represented a cognitive advantage during a perilous period, and it remains a reminder of the timeless power of cognitive persuasion. Today, just as in 1943, we must seize and defend the cognitive advantage if we are to navigate these equally perilous times. History proves the advantage: in cognitive warfare, facts alone rarely shift outcomes—compelling narratives and persuasive storytelling do. It is time to take a bold step forward in the cognitive domain and to seize the cognitive advantage. The Cipher Brief is committed to publishing a range of perspectives on national security issues submitted by deeply experienced national security professionals.