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The main department of the US Department of Homeland Security

Assistant Secretary of Homeland Security (US Immigration and Customs Enforcement)

Assistant Secretary of Homeland Security (Department of Transportation Security)

Director of US Customs and Border Service

Director of United States citizenship and immigration

Director united states secret service.

Director of Federal Law Enforcement Training Center

Commander of the U.S. Coast Guard (handed over to the U.S. Navy Department under the U.S. Department of Defense in wartime)

After the reorganization on March 6, 2004, the Department of Homeland Security established the National Accident Management System (NIMS). Objective To provide consistent national assistance to three administrative regions (federal, state and local) in the United States. A few months later, the National Response Plan (NRP) was established with NIMS as the template, with the purpose of coordinating the original coordination structure of federal government departments and providing unified all-weather local accident management.