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U.S. Department of Homeland Security (DHS) Science and Technology Directorate (S&T) Under Secretary Dr. Reginald Brothers, Office of Health Affairs (OHA) Assistant Secretary and Chief Medical Officer Dr. Kathryn Brinsfield, and Domestic Nuclear Detection Office (DNDO) Director Dr. Huban Gowadia address DHS’ work to strengthen departmental unity of effort with regard to chemical, biological, radiological, nuclear, and explosive threats to the nation.