Deterrence work against a mad man, or a suicidal fanatic . Do we need to be thinking about deterrence 2. 0 because of that potential lack of rationality on the other side that wouldnt be concerned about the destruction of their country or perhaps theyre possessing Nuclear Weapons and dont have a country to destroy. Senator, i think we need to look at deterrence 2. 0, 3. 0, 4. 0 and deterrence in the 21st century, i think is fundamentally different than it was in the 20th century. Deterrence in the 21st century involves all elements of national power. Not just nuclear deterrent. Involves space and cyber and conventional forces, it involves offense and defense on the strategic side of the house. You have to look at the integrated defensive capabilities if youre talking about responding to north korea or iran, and that defensive capability because an essential element of our deterrent posture. We also have to think about who were deterring. And what works. What would what would be the aga