CIMSEC – The central challenge of modern naval warfare is grappling with profound decision-making under uncertainty. Our current doctrine, NDP-1 Naval Warfare, is an essential description of our forces, but it is insufficient as a guide for thinking through the friction, fluidity, and ambiguity inherent in conflict. To truly equip our Sailors to fight and win for tomorrow, the CNO should supplement this document with a doctrine focused on the cognitive art of warfighting. The solution is to champion a new, companion publication – NDP-1.1 Naval Warfighting.