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Homeland security as a domestic defense strategy became a national priority after the September 11, 2001, attacks on the World Trade Center in New York City, the Pentagon in northern Virginia, and United Airlines Flight 93 that crashed in Pennsylvania. The attacks, conducted by the terrorist group, al Qaeda, resulted in nearly 3,000 deaths, including 343 firefighters and 60 police officers who responded to the attacks. Those attacks led to changes in how government bodies in the United States respond to terrorist threats.

The attacks and the new emphasis on homeland security resulted in changes in government at all levels, particularly the federal government. It created new thinking in the Department of Defense. Rather than focusing primarily on traditional warfare involving wars with nation-states, the U.S. military began using unconventional warfare tactics and engaging in military operations designed to combat terrorist groups and terrorist threats. In 2002, as mandated in the Homeland Security Act of 2002 (P.L. 107–296), the Department of Homeland Security (DHS) was created by reorganizing many departments and agencies in the federal government. Agencies such as the U.S. Customs and Border Protection, Secret Service, the Federal Emergency Management Agency (FEMA), the Transportation Security Administration, and the National Domestic Preparedness Office became part of the newly organized Department of Homeland Security, creating the third largest department in the federal government.

This entry begins by defining homeland security and then details government efforts involving homeland security since 9/11. Last, this entry explains how the strategies involved in community policing fit into a homeland security strategy.

Homeland Security Defined

Homeland security refers to efforts to protect a nation against terrorism and other hazards that may threaten it. The U.S. Department of Homeland Security (DHS) has identified five core mission areas of the nation’s homeland security strategy: (1) preventing terrorism and enhancing security, (2) securing and managing the nation’s border, (3) enforcing and administering the nation’s immigration laws, (4) safeguarding and securing cyberspace, and (5) ensuring resilience to disasters. As can be seen from the DHS’s missions, homeland security not only applies to terrorist attacks but also encompasses natural disasters (e.g., fires, earthquakes, tornados, and hurricanes) and man-made disasters (e.g., chemical fires or transportation accidents involving hazardous materials).

When terrorist attacks, natural disasters, or other events involving homeland security occur in a local community, the initial response comes from local public safety and disaster response personnel, including police officers, firefighters, medical personnel, and other disaster agency officials. If the situation requires greater resources than the local authorities can provide, state agencies may become involved. States have disaster relief and response agencies, and personnel from these agencies often assist local first responders in the event of a disaster. Finally, if the state does not have adequate resources to respond effectively, the federal government is available to assist. The primary federal agency is the Federal Emergency Management Agency (FEMA), but other agencies may be called in depending on the nature and severity of the event. This layered response places considerable responsibility on local authorities, especially the police, who very likely are first on the scene. Because of this tiered response strategy, local law enforcement has to develop critical homeland security capabilities, including substantially increasing the number and types of skills that police officers possess.

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