Protecting the American people from terrorist threats is our founding principle and our highest priority. The Department of Homeland Security's counterterrorism responsibilities focus on three goals:

1. Prevent terrorist attacks;
2. Prevent the unauthorized acquisition, importation, movement, or use of chemical, biological, radiological, and nuclear materials and capabilities within the United States; and
3. Reduce the vulnerability of critical infrastructure and key resources, essential leadership, and major events to terrorist attacks and other hazards.

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Global Aviation Security
Cargo Screening
Enhance National Preparedness and Support State and Local Law Enforcement
Strengthen International Partnerships
Critical Infrastructure Protection