The mission of the Deputy Assistant Secretary of Defense for Countering Weapons of Mass Destruction (CWMD) is to support the Under Secretary of Defense for Policy and Assistant Secretary of Defense for Homeland Defense & Global Security by developing and overseeing the implementation of all Countering Weapons of Mass Destruction (CWMD) strategies and policies to include preventing the proliferation of WMD and WMD-related materials; the DoD Cooperative Threat Reduction (CTR) Program; Chemical, Biological, Radiological and Nuclear (CBRN) defense; and advancing global mobility through freedom of navigation policy.