> ## Content Index > Fetch the complete content index at: https://www.whiteroseintelligence.com/llms.txt > Use this file to discover other available public pages before exploring further. # United States Department of Homeland Security - URL: https://www.whiteroseintelligence.com/united-states-department-of-homeland-security/ - Published: 2026-03-13T19:26:00.000Z - Updated: 2026-03-13T19:27:03.000Z - Author: Liam Sturgess - Tags: Profiles, #docs, #organization, Organization, United States, Government, #toc, Politics, Military The **United States Department of Homeland Security (DHS)** is a department of the [United States Federal Government](https://www.whiteroseintelligence.com/United-States-Federal-Government). ## History 22 governmental departments were transferred to the control of the newly-created Department of Homeland Security as of March 1, 2003, including the [United States Secret Service](https://www.whiteroseintelligence.com/United-States-Secret-Service).[\[1\]](#fn1) ### 2020 presidential election On November 5, 2019, representatives from DHS participated in a counter-terrorism exercise called Operation Blackout, simulating an attack on the 2020 United States presidential election. It was organized by [Cybereason](https://www.whiteroseintelligence.com/Cybereason), and participants included the [Federal Bureau of Investigation](https://www.whiteroseintelligence.com/Federal-Bureau-of-Investigation) (FBI), the [United States Secret Service](https://www.whiteroseintelligence.com/United-States-Secret-Service) and the law firm Venable.[\[2\]](#fn2) ## Organization | Name | Position | Notes | | ------------------ | ---------------------------------------------------- | ----- | | Alejandro Mayorkas | Secretary of Homeland Security (former)[\[3\]](#fn3) | \- | ### Subsidiaries - Federal Emergency Management Agency (FEMA) - United States Customs and Border Patrol (CBP) - [United States Secret Service](https://www.whiteroseintelligence.com/United-States-Secret-Service) ## External links - [SourceWatch](https://www.sourcewatch.org/index.php/United%5FStates%5FDepartment%5Fof%5FHomeland%5FSecurity) - [Wikipedia](https://en.wikipedia.org/wiki/United%5FStates%5FDepartment%5Fof%5FHomeland%5FSecurity) - [Wikispooks](https://wikispooks.com/wiki/US/Department/Homeland%5FSecurity) --- 1. *Coast Guard joins Homeland Security Department.* (2003, February 26). CNN. [↩︎](#fnref1) 2. *Operation Blackout Summary of Events.* (2019, November 5). Cybereason. [↩︎](#fnref2) 3. O’Brien, R. D., & Schleifer, T. (2024, July 15). *Robert F. Kennedy Jr. Meets With Trump at the R.N.C.* The New York Times. [↩︎](#fnref3)