The Homeland Security layer provides operations centers and services for many levels of Homeland Security operations. Operations centers include: the White House Situation Room (WHSR); the National Security Council (NSC); the National Security Telecommunications Advisory Committee (NSTAC); the Homeland Security Advisory Council (HSAC); the Homeland Security Council (HSC); the Homeland Security Science and Technology Advisory Committee (HSSTAC); the National Counter Terrorism Center (NCTC); Homeland Security Operations Center (HSOC); the U.S. Computer Emergency Readiness Team (US-CERT); and the National Operations Center (NOC). Under the NOC: Customs and Border Protection Situation Room (CBP-SR); Immigration and Customs Enforcement (ICE); Interagency Incident Management Group (IIMG); the National Coordinating Center for Telecommunications (NCC); the Office of Intelligence and Analysis (OIA); the Planning Element (PE); the Transportation Security Operations Center (TSOC); the U.S. Coast Guard (USCG); Federal, regional and state Fusion Centers and the U.S. Secret Service.
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Whereas the Department of Defense is charged with military actions abroad, the Department of Homeland Security works in the civilian sphere to protect the United States within, at, and outside its borders. Its stated goal is to prepare for, prevent, and respond to domestic emergencies, particularly terrorism.[3] On March 1, 2003, DHS absorbed the Immigration and Naturalization Service and assumed its duties. In doing so, it divided the enforcement and services functions into two separate and new agencies: Immigration and Customs Enforcement and Citizenship and Immigration Services. Additionally, the border enforcement functions of the INS, the U.S. Customs Service, and the Animal and Plant Health Inspection Service were consolidated into a new agency under DHS: U.S. Customs and Border Protection. The Federal Protective Service falls under the National Protection and Programs Directorate.