- Department of Homeland Security (DHS)
 - Official Department of Homeland Security site, featuring news, research and technology, current terror alerts and threats, links to sub-agencies, and more. - Bureau of U.S. Citizenship and Immigration Service (20)
- Chertoff, Michael - Secretary of Homeland Security (2)
- DHS: Travel Security & Procedures
- Outlines the travel and security procedures of the TSA and the U.S. Department of Homeland Security.
- Executive Order Establishing the Office on Homeland Security
- Homeland Security Act of 2002
(PDF) - Features the text of the Act from FindLaw.
- Homeland Security Advisory System
- Press release outlining the colour-coded terrorism alert warning system.
- Homeland Security Cultural Bureau
- Providing executive and public awareness of the role that culture can play in both endangering, as well as promoting, a secure nation.
- Lawrence Livermore National Laboratory (15)
- National Homeland Security Knowledgebase
- Features a collection of links on homeland security related topics and resources.
- Office of Federal Protective Service
- Operation Liberty Shield (1)
- Ready.gov
- Make a kit, make a plan, and be informed. From the U.S. Department of Homeland Security.
- U.S. Immigration and Customs Enforcement
- Provides news, contact information, careers, and details about Immigration and Customs Enforcement, the largest investigative branch of the U.S. Department of Homeland Security.
- United States Computer Emergency Readiness Team (US-CERT)
- Manages the National Cyber Alert System.
- United States Secret Service (3)
- US-VISIT Program
- Features a fact sheet for the program.
- White House: Homeland Security Department
- Coordinating national strategy to strengthen protections against terrorist threats or attacks in the United States. Official White House site. Includes current terrorist threat level.
- Wikipedia: United States Department of Homeland Security
- Article about the U.S. Department of Homeland Security, a cabinet level department with the task of protecting the United States.
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