Official website of the Department of Homeland Security
Who Joined DHS
Learn more about how the Department of Homeland Security (DHS) was created through the integration of all or part of 22 different federal departments and agencies into a unified, integrated Department and how DHS has become a more effective Department.
Learn More
Creation of the Department of Homeland Security
Chronology of Events
| Lead up to 9/11 | Today |
| The U.S. Customs Service (Treasury) | U.S. Customs and Border Protection - inspection, border and ports of entry responsibilities
U.S. Immigration and Customs Enforcement - customs law enforcement responsibilities |
| The Immigration and Naturalization Service (Justice) | U.S. Customs and Border Protection - inspection functions and the U.S. Border Patrol
U.S. Immigration and Customs Enforcement - immigration law enforcement: detention and removal, intelligence, and investigations U.S. Citizenship and Immigration Services - adjudications and benefits programs |
| The Federal Protective Service | U.S. Immigration and Customs Enforcement until 2009); currently resides within the National Protection and Programs Directorate |
| The Transportation Security Administration (Transportation) | Transportation Security Administration |
| Federal Law Enforcement Training Center (Treasury) | Federal Law Enforcement Training Center |
| Animal and Plant Health Inspection Service (part)(Agriculture) | U.S. Customs and Border Protection - agricultural imports and entry inspections |
| Office for Domestic Preparedness (Justice) | Responsibilities distributed within FEMA |
| The Federal Emergency Management Agency (FEMA) | Federal Emergency Management Agency |
| Strategic National Stockpile and the National Disaster Medical System (HHS) | Returned to Health and Human Services, July, 2004 |
| Nuclear Incident Response Team (Energy) |
Responsibilities distributed within FEMA |
| Domestic Emergency Support Teams (Justice) | Responsibilities distributed within FEMA |
| National Domestic Preparedness Office (FBI) |
Responsibilities distributed within FEMA |
| CBRN Countermeasures Programs (Energy) | Science & Technology Directorate |
| Environmental Measurements Laboratory (Energy) | Science & Technology Directorate |
| National BW Defense Analysis Center (Defense) | Science & Technology Directorate |
| Plum Island Animal Disease Center (Agriculture) | Science & Technology Directorate |
| Federal Computer Incident Response Center (GSA) | US-CERT, Office of Cybersecurity and Communications in the National Protection and Programs Directorate |
| National Communications System (Defense) | Office of Cybersecurity and Communications in the National Protection and Programs Directorate |
| National Infrastructure Protection Center (FBI) | Dispersed throughout the Department, including Office of Operations Coordination and Office of Infrastructure Protection |
| Energy Security and Assurance Program (Energy) |
Integrated into the Office of Infrastructure Protection |
| U.S. Coast Guard | U.S. Coast Guard |
| U.S. Secret Service | U.S. Secret Service |
The following three directorates, created by the Homeland Security Act of 2002 were abolished by a July 2005 reorganization and their responsibilities transferred to other departmental components:
- Border and Transportation Security
- Emergency Preparedness and Response
- Information Analysis and Infrastructure Protection
Historical Documents
- Organizational Chart (PDF, 1 page - 419 KB) pre-FY04.