Welcome to the Website for the Department of Defense Chief Information Officer (DoD CIO). The DoD CIO is the principal staff assistant and senior advisor to the Secretary of Defense and Deputy Secretary of Defense for information technology (IT) (including national security systems and defense business systems), information resources management (IRM), and efficiencies. This means that DoD CIO is responsible for all matters relating to the DoD information enterprise, such as cybersecurity, communications, information systems, and more. To learn more, please read about the DoD Digital Modernization Strategy, the DoD CIO organization’s current charter, or browse this website.