The mission of the Deputy Assistant Secretary of Defense for Nuclear and Countering Weapons of Mass Destruction (CWMD) Policy is to support the Under Secretary of Defense for Policy and Assistant Secretary of Defense for Space Policy by developing strategies, informing policies, and conducting oversight of nuclear deterrence policy and arms control, as well as developing and overseeing the implementation of strategies and policies of all Countering Weapons of Mass Destruction policy issues, to include preventing the proliferation of WMD-related materials; the DoD Cooperative Threat Reduction (CTR) Program; and Chemical, Biological, Radiological and Nuclear (CBRN) defense.