Since the end of the Cold War, assumptions based on U.S. preeminent military and economic power have encouraged generally passive or reactive national security policies. This must change. A theory of victory in this era’s great-power competition requires that the Navy be able both to field a war-winning fleet and to compete aggressively in the peace. In the final analysis, chance aside, the outcome of war will be determined before the fighting actually starts: The better postured, resourced, and trained force is the force that wins. Ensuring that the Navy remains ready, vigilant, and postured forward is the best way to deter war and perpetuate the rules-based order that has safeguarded our prosperity and the prosperity of others for decades.