After more than a decade of revamping the United States counterterrorism apparatus, there remains critical work to be done. Swelling budgets and added components of government bureaucracy are tools of the past that should be left behind. The United States must marshal the resources of state and local governments to supplement and augment robust federal counterterrorism efforts in the face of an everchanging threat. To ensure the best counterterrorism enterprise for protecting the homeland, leaders in Washington must pursue better partnerships with state and local counterparts while streamlining federal coordination. Leveraging the strengths of the U.S. federalist system is the best path to enhancing U.S. counterterrorism efforts and protecting long-term U.S. interests.