Twice in the last century, Congress has rewritten the rules for how America organizes its military. Each overhaul unlocked leaps in US combat power. In 1947, the National Security Act dissolved the War and Navy Departments to create the Department of Defense, Joint Chiefs of Staff, CIA, and National Security Council. It was the first time America intentionally organized itself to manage a large, globally deployed peacetime military. That was DoD 1.0. (Later, the Defense Reorganization Act of 1958 addressed deficiencies of the previous plan and growing interservice rivalries by empowering the secretary of defense, setting a DoD 1.5.)