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This page tells all about the duties, roles, and requirements of the Secretary of Homeland Security and the Department of Homeland Security. It is part of our United States Government series.

Department of Homeland Security Seal
Department of Homeland Security Seal

The Secretary of Homeland Security is the top official of the U.S. Department of Homeland Security. Responsibilities include protecting the United States from domestic and International terrorist threats, and responding to natural disasters. In addition, the Department for Homeland Security has taken over the former duties of the United States Immigration and Naturalization Service and has divided those duties between two units, U.S. Immigration and Customs Enforcement and U.S. Citizenship and Immigration Services. The Department of Homeland Security was formed shortly after the 9/11 Terrorist attacks. It is now the third largest cabinet-level department, and employs over 200,000 people. Units under the Department of Homeland Security include the U.S. Customs Service, U.S. Coast Guard, U.S. Secret Service, Immigration and Naturalization Service, and the Federal Emergency Management Agency (FEMA).

United States Government Navigation

Executive Branch


Legislative Branch

House of Representatives

Judicial Branch

Supreme Court
U.S. Court of Appeals
U.S. District Courts

Executive Department Heads

Secretary of Agriculture
Secretary of Commerce
Secretary of Defense
Secretary of Education
Secretary of Energy
Secretary of Health and Human Services
Secretary of Homeland Security
Secretary of Housing and Urban Development
Secretary of the Interior
Attorney General
Secretary of Labor
Secretary of State
Secretary of Transportation
Secretary of the Treasury
Secretary of Veterans Affairs

Government Structure


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