The U.S. Department of Homeland Security was formed in November 2002 , succeeding the U.S. Office of Homeland Security ( OHS ) , which was created in October 2001 in response to the September 11 attacks . Whereas the OHS was a subsidiary office of the Executive Office of the President ( EOP ) , the DHS is an independent , cabinet-level department
September 11 attacks
September 11 attacks
Seal of the United States Department of Homeland Security