<P> The most recent Secretary, John F. Kelly, was replaced by Acting Secretary and current Deputy Secretary Elaine Duke on Monday, July 31, 2017 . </P> <P> 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 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 . 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 agency under DHS: U.S. Customs and Border Protection . The Federal Protective Service falls under the National Protection and Programs Directorate . </P> <P> 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 . </P> <Table> <Tr> <Th> Child Agency </Th> <Th> Title of Head / Leader </Th> <Th> Incumbent </Th> </Tr> <Tr> <Td> Citizenship & Immigration Services Ombudsman </Td> <Td> Director </Td> <Td> Maria M. Odom </Td> </Tr> <Tr> <Td> Domestic Nuclear Detection Office </Td> <Td> Director </Td> <Td> James F. McDonnell </Td> </Tr> <Tr> <Td> Federal Emergency Management Agency </Td> <Td> Administrator </Td> <Td> Brock Long </Td> </Tr> <Tr> <Td> Federal Law Enforcement Training Centers </Td> <Td> Director </Td> <Td> Connie L. Patrick </Td> </Tr> <Tr> <Td> Management Directorate </Td> <Td> Under Secretary </Td> <Td> Russell Deyo </Td> </Tr> <Tr> <Td> National Protection and Programs Directorate </Td> <Td> Under Secretary </Td> <Td> Suzanne E. Spaulding </Td> </Tr> <Tr> <Td> Office for Civil Rights & Civil Liberties </Td> <Td> Officer </Td> <Td> Megan H. Mack </Td> </Tr> <Tr> <Td> Office of General Counsel </Td> <Td> General Counsel </Td> <Td> Stevan E. Bunnell </Td> </Tr> <Tr> <Td> Office of Health Affairs </Td> <Td> Assistant Secretary / Chief Medical Officer </Td> <Td> Kathryn Brinsfield </Td> </Tr> <Tr> <Td> Office of Intelligence and Analysis </Td> <Td> Under Secretary </Td> <Td> David Glawe </Td> </Tr> <Tr> <Td> Office of Legislative Affairs </Td> <Td> Assistant Secretary </Td> <Td> M. Tia Johnson </Td> </Tr> <Tr> <Td> Office of Operations Coordination </Td> <Td> Director </Td> <Td> Richard M. Chávez </Td> </Tr> <Tr> <Td> Office of Partnership & Engagement </Td> <Td> Assistant Secretary </Td> <Td> </Td> </Tr> <Tr> <Td> Office of Policy </Td> <Td> Assistant Secretary </Td> <Td> </Td> </Tr> <Tr> <Td> Office of Public Affairs </Td> <Td> Assistant Secretary </Td> <Td> </Td> </Tr> <Tr> <Td> Office of the Inspector General </Td> <Td> Inspector General </Td> <Td> John Roth </Td> </Tr> <Tr> <Td> Privacy Office </Td> <Td> Chief Privacy Officer / Chief FOIA Officer </Td> <Td> Jonathan R. Cantor </Td> </Tr> <Tr> <Td> Science & Technology Directorate </Td> <Td> Under Secretary </Td> <Td> </Td> </Tr> <Tr> <Td> Transportation Security Administration </Td> <Td> Administrator </Td> <Td> Huban A. Gowadia </Td> </Tr> <Tr> <Td> United States Citizenship and Immigration Services </Td> <Td> Acting Director </Td> <Td> James McCament </Td> </Tr> <Tr> <Td> United States Coast Guard </Td> <Td> Commandant </Td> <Td> Admiral Paul F. Zukunft </Td> </Tr> <Tr> <Td> U.S. Customs and Border Protection </Td> <Td> Acting Commissioner </Td> <Td> Kevin K. McAleenan </Td> </Tr> <Tr> <Td> U.S. Immigration and Customs Enforcement </Td> <Td> Acting Director </Td> <Td> Thomas D. Homan </Td> </Tr> <Tr> <Td> United States Secret Service </Td> <Td> Director </Td> <Td> Randolph D. Alles </Td> </Tr> </Table>

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