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Homeland Security

Resource Directory

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Research and development is critical to enabling the success of the Department of Homeland Security (DHS) and its nuclear security mission partners. The Domestic Nuclear Detection Office (DNDO) leads the Department's efforts in the development of near- and long-term radiological and nuclear detection capabilities.
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The transit and border layer (Trans-Border) is composed of transit to the U.S. from a foreign port of departure or non-port of departure, as well as passing through the U.S. border prior to entering the U.S. interior. This represents the last opportunity to detect radiological or nuclear materials prior to their arrival onto U.S. territory, and initiatives in this layer emphasize maritime domain awareness related to preventive radiological/nuclear detection.

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Working in close cooperation with its nuclear security stakeholders, the Department of Homeland Security has developed the Global Nuclear Detection Architecture (GNDA).
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The nation’s success in preventing nuclear terrorism is a result of the close collaboration between the Department and its international, federal, state, local, tribal, and territorial partners.
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The Department of Homeland Security (DHS) conducts tests to evaluate the performance of radiological and nuclear detection systems (to include technology components, algorithms and materials), at specialized facilities, laboratories, or operational venues. The Domestic Nuclear Detection Office leads the Department’s efforts to test and evaluate these technologies.
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The National Strategy for Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Standards lays out the federal vision and goals to achieve a comprehensive structure for coordination, establishment, and implementation of CBRNE equipment standards by 2020.

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The Ombudsman's Office hosts public stakeholder events to share information, receive feedback on specific topics, and to hear your comments and suggestions regarding your interactions with the U.S. Citizenship and Immigration Services (USCIS).

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To support the nationwide launch of the "If You See Something, Say Something™" public awareness campaign, Secretary Janet Napolitano released a series of Public Service Announcements (PSAs) encouraging the public to contact local authorities if they see suspicious activity.

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The Office of the Secretary oversees the Department's work to enhance security, protect cyberspace, administer immigration and respond to disasters.

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A listing of all components, directorates and offices with websites or webpages on DHS.gov that currently make up the Department of Homeland Security.

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