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The United States Department of Homeland Security ( DHS ) is the U.S. federal executive department responsible for public security, roughly comparable to the interior or home ministries of other countries. Its stated missions involve anti-terrorism, border security, immigration and customs, cyber security, and disaster prevention and management. It began operations in 2003, formed as a result of the Homeland Security Act, enacted the previous year in response to the 9/11 attacks. With more than 240,000 employees, DHS is the third largest Cabinet department, after the Departments of Defense and Veterans Affairs. Homeland security policy is coordinated at the White House by the Homeland Security Council. Other agencies with significant homeland security responsibilities include the Departments of Health and Human Services, Justice, and Energy.

Creation edit In response to the September 11 attacks, President George W. Bush announced the establishment of the Office of Homeland Security (OHS) to coordinate "homeland security" efforts. The office was headed by former Pennsylvania Governor Tom Ridge, who assumed the title of assistant to the president for homeland security. The official announcement states: The mission of the Office will be to develop and coordinate the implementation of a comprehensive national strategy to secure the United States from terrorist threats or attacks. The Office will coordinate the executive branch's efforts to detect, prepare for, prevent, protect against, respond to, and recover from terrorist attacks within the United States. Ridge began his duties as OHS director on October 8, 2001. On November 25, 2002, the Homeland Security Act established the Department of Homeland Security to consolidate U.S. executive branch organizations related to "homeland security" into a single

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. On March 1, 2003, DHS absorbed the U.S. Customs Service and Immigration and Naturalization Service (INS) 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. The investigative divisions and intelligence gathering units of the INS and Customs Service were merged forming Homeland Security Investigations, the primary investigative arm of DHS. Additionally, the border enforcement functions of the INS, including the U.S. Border Patrol, the U.S. Customs Service, and the Animal and Plant Health Inspection Service were consolidated into a new

The Department of Homeland Security is headed by the Secretary of Homeland Security with the assistance of the Deputy Secretary. The department contains the components listed below. Subordinate agency Title of head or leader Incumbent Management Directorate Under Secretary Randolph D. "Tex" Alles (acting) Science and Technology Directorate Under Secretary William Bryan (acting) Office of Intelligence and Analysis Under Secretary none as of August 3, 2020 Office of Strategy, Policy, and Plans Under Secretary Chad Wolf United States Citizenship and Immigration Services Director Mark Koumans (acting) United States Coast Guard Commandant Admiral Karl L. Schultz U.S. Customs and Border Protection Commissioner Mark A. Morgan (acting) Cybersecurity and Infrastructure Security Agency Director vacant Federal Emergency Management Agency Administrator Pete Gaynor Federal Law Enforcement Training Centers Director Thomas J. Walters U.S. Immig

In 2011, the Department of Homeland Security phased out the old Homeland Security Advisory System, replacing it with a two-level National Terrorism Advisory System. The system has two types of advisories: alerts and bulletins. NTAS bulletins permit the secretary to communicate critical terrorism information that, while not necessarily indicative of a specific threat against the United States, can reach homeland security partners or the public quickly, thereby allowing recipients to implement necessary protective measures. Alerts are issued when there is specific and credible information of a terrorist threat against the United States. Alerts have two levels: elevated and imminent. An elevated alert is issued when there is credible information about an attack but only general information about timing or a target. An Imminent Alert is issued when the threat is very specific and impending in the very near term. On March 12, 2002, the Homeland Security Advisory System, a color-coded terror

A DHS press release dated June 6, 2003 explains the seal as follows: The seal is symbolic of the Department's mission – to prevent attacks and protect Americans – on the land, in the sea and in the air. In the center of the seal, a graphically styled white American eagle appears in a circular blue field. The eagle's outstretched wings break through an inner red ring into an outer white ring that contains the words "U.S. DEPARTMENT OF" in the top half and "HOMELAND SECURITY" in the bottom half in a circular placement. The eagle's wings break through the inner circle into the outer ring to suggest that the Department of Homeland Security will break through traditional bureaucracy and perform government functions differently. In the tradition of the Great Seal of the United States, the eagle's talon on the left holds an olive branch with 13 leaves and 13 seeds while the eagle's talon on the right grasps 13 arrows. Centered on the eagle's breast