On this episode of the DefAero Report Daily Podcast, sponsored by Bell, Dr. Harlan Ullman, a retired US Navy captain, strategist and chairman of the Killlowen Group consultancy, discusses his new book — “The Fifth Horseman and the New MAD: How Massive Attacks of Disruption Became the Looming Existential Danger to a Divided Nation and the World at Large” — with Defense & Aerospace Report Editor Vago Muradian.