for: United States Department of Homeland Security for: Homeland Security (film) The term homeland security refers to the broad national effort by all levels of government to protect its territory from hazards, both internal and external, natural and man-made. The term is most often used in the United States; elsewhere, national security has more usage. The term is also used to refer to the United States Department of Homeland Security itself.

In the United States

In the United States, the concept of "homeland security" extends and recombines responsibilities of several government agencies and entities, including the United States National Guard, the Federal Emergency Management Agency, the United States Coast Guard, U.S. Customs and Border Protection, U.S. Immigration and Customs Enforcement, United States Citizenship and Immigration Services, the United States Secret Service, the Transportation Security Administration, and Civil Air Patrol. The George W. Bush administration has consolidated many of these activities under the United States Department of Homeland Security (DHS), a new cabinet department established as a result of the Homeland Security Act of 2002. However, much of the nation's homeland security activity remains outside of DHS; for example, the FBI and CIA are not part of the Department, and other agencies such as the Department of Defense and Department of Health and Human Services play a significant role in certain aspects of homeland security. Homeland security is coordinated at the White House by the Homeland Security Council, currently headed by Frances Townsend.

Homeland security is officially defined by the National Strategy for Homeland Security as "a concerted national effort to prevent terrorist attacks within the United States, reduce America's vulnerability to terrorism, and minimize the damage and recover from attacks that do occur". Because the U.S. Department of Homeland Security includes the Federal Emergency Management Agency, it also has responsibility for preparedness, response, and recovery to natural disasters.

The term became prominent in the United States following the September 11, 2001 attacks; it had been used only in limited policy circles prior to these attacks. The phrase "security of the American homeland" appears in the 1998 report Catastrophic Terrorism: Elements of a National Policy by Ashton B. Carter, John M. Deutch, and Philip D. Zelikow.

Homeland security is also usually used to connote the civilian aspect of this effort; "homeland defense" refers to its military component, led chiefly by the U.S. Northern Command headquartered in Colorado Springs, Colorado.

The scope of homeland security includes:

• Emergency preparedness and response (for both terrorism and natural disasters), including volunteer medical, police, Emergency Management and fire personnel;
• Domestic intelligence activities, largely today within the FBI;
• Critical infrastructure protection;
• Border security, including both land and maritime borders;
• Transportation security, including aviation and maritime transportation;
• Biodefense;
• Detection of radioactive and radiological materials;
• Research on next-generation security technologies.