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About CWMD

Congress established the Countering Weapons of Mass Destruction Office (CWMD) in 2018 to lead the Department of Homeland Security's (DHS) efforts to safeguard the United States against chemical, biological, radiological, and nuclear (CBRN) and related threats. It develops departmental strategic guidance; monitors and reports on threats; generates and distributes risk assessments; researches, develops, acquires, and deploys equipment, and conducts training and exercises, in support of State, Local, Tribal, and Territorial (SLTT) communities and law enforcement, and its DHS and interagency partners.


The Countering Weapons of Mass Destruction Office (CWMD) leads DHS efforts and coordinates with domestic and international partners to safeguard the United States against CBRN threats.


CWMD is the leader in preventing WMD attacks through timely, responsive support to operational partners.


CWMD is led by Assistant Secretary Mary Ellen Callahan.


About CWMD Graphic representing the various partners that CWMD works with. This includes DHS and its components, and other partners like Interagency partners, state and local governments, law enforcement, emergency medical services, first responders, universities, laboratories, public health officials, and industry.

CWMD partners with the following:

  • DHS and its components:
    • Customs and Border Protection
    • United States Coast Guard
    • Immigration and Customs Enforcement
    • Transportation Security Administration
    • United States Secret Service
    • Homeland Security Investigations
    • Federal Emergency Management Agency
  • Interagency partners
  • State and local governments
  • Law enforcement
  • Emergency medical services
  • First responders
  • Universities
  • Laboratories
  • Public health officials
  • Industry

Last Updated: 06/18/2024
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