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Deputy Assistant Secretary of Defense for Cyber Policy

Cyber capabilities provide unique national security and economic advantages that cannot be replaced through operations in other domains. As such, cyber capabilities have become integrated into our daily lives and have become vital to U.S. national security and support the architecture of the modern international system and enable a vibrant global economy. At the same time, the potential adversaries continue to seek means to counter the advantages obtained from space and cyber capabilities and to use these same capabilities for purposes hostile to U.S. interests.

 Establishes and oversees the implementation of DoD cyberspace policy and strategy. Integrates national cyberspace policy and guidance with DoD cyberspace policy. Provides guidance and oversight on DoD cyberspace activities as they relate to foreign cyberspace threats, international cooperation, engagement with foreign partners and international organizations, and implementation of DoD cyberspace strategy and plans, including those related to cyberspace forces, capabilities, and their employment.


2015 Cyber Strategy
  • Office of Primary Responsibility within OSD for policy matters related to activities in cyber or involving cyber systems
  • Ensure cyber -related activities are integrated into national and DoD strategies
  • Develop, coordinate and oversee implementation of U.S. Government and DoD policy and strategy for military and intelligence cyber operations activities.
  •  Formulates specific DoD policies and guidance on:
    • Cyber forces, systems and their employment
    • International agreements and legal regimes, including arms control matters
    • Integration of cyber capabilities into operations and contingency plans
    • International, U.S. Government, and DoD cyber operations cooperation
  • Review and evaluate cyber related programs, plans, and system requirements
  • Participate in planning and budgeting activities for space and cyber systems
  • Represent OSD at interagency deliberations and international negotiations
  • Interface with other U.S. Government Departments and Agencies, Congress, the public, and foreign governments on cyber policy matters



Thomas Wingfield, Deputy Assistant Secretary of Defense for Cyber Policy 

Mr. Thomas C. Wingfield was appointed the Deputy Assistant Secretary of Defense for Cyber Policy on November 25, 2019. In this capacity, he supports the Secretary of Defense and other senior Department of Defense leaders by formulating, recommending, integrating, and implementing policies and strategies to improve DoD’s ability to operate in cyberspace. Prior to this appointment, Mr. Wingfield was the Acting Chancellor and Dean of Faculty and Academic Programs at the College of Information and Cyberspace at the National Defense University in Washington, DC.

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Madeline Mortelmans (Principal Director for Cyber Policy)


Madeline Mortelmans is the Principal Director for Cyber Policy. Madeline has worked in the Office of the Secretary of Defense since 2004 in numerous roles, including as Special Assistant to two Under Secretaries, and in roles advising on strategy and budget, and Asia. Prior to joining the cyber office, Madeline was detailed to the U.S. Mission to the Organization for Security and Cooperation in Europe (OSCE), advising the Ambassador on defense issues and supporting negotiations for cyber confidence building measures. Before joining OSD, Madeline worked as a contractor to the Defense Threat Reduction Agency on the Cooperative Threat Reduction Program.

Contact Information

2600 Defense Pentagon
Washington, D.C. 20301-2900