Department of Homeland Security Assistant Secretary for the Countering Weapons of Mass Destruction Office Mary Ellen Callahan speaks with 海角社区app's J.J. Green
Department of Homeland Security Assistant Secretary for the Countering Weapons of Mass Destruction Office Mary Ellen Callahan spoke with 海角社区app national security correspondent J.J. Green about the importance of the department鈥檚 work to combat chemical, biological, radiological, and nuclear threats.
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