Most leaders share the ultimate international interest to place greater emphasis on conventional military forces and dramatically reduce, if not eliminate, nuclear weapons. But this can only be achieved from a position of strength, not risk. While the Cold War strategies centered on building greater nuclear forces based on a confrontational standoff, the Cooperative Security strategy focuses on reducing nuclear forces found on multipolar cooperation. Their common denominator: Both rely on a position of nuclear deterrent strength. Cooperative Security is not the strategy that will close the nuclear era. It is a first step towards an evolving, comprehensive strategy that reconciles nuclear weapons with the new world realities and embraces, not ignores, the lessons of the nuclear debate. The world has an unprecedented opportunity to dramatically reduce the nuclear threat through cooperation. But to succeed, the US must create a comprehensive new Cooperative Security strategy for an uncertain world that builds upon the proven security of nuclear deterrence while nations cooperatively reduce, if not eliminate, the nuclear age.