The DHS has the tremendous responsibility of ensuring that the U.S. government's protection and response policies for future terrorist activities are coordinated and effective. In the early 2000s more than one hundred different government organizations had various responsibilities for homeland security and reported to the DHS. The names of only a few of those agencies are the FBI Counter-Intelligence Division, the Central Intelligence Agency (CIA), the National Security Agency (NSA), the Nuclear Regulatory Commission (NRC), the National Security Council, the Defense Intelligence Agency (DIA), and the intelligence departments of the Department of Energy, Department of Transportation, army, navy, air force, and marines. In addition, states and local law enforcement agencies have special counterterrorism units that work together with federal agents to identify and neutralize ongoing national security threats.
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