Countering Cyber Threats through Technical Cooperation with the Department of Defense, Fiscal Year 2015 Report to Congress [open pdf - 460KB]
From the Introduction: "The DHS vision of the Internet is of a safe, secure, and resilient infrastructure through which the American way of life can thrive. Many Components in DHS contribute to this mission: the Office of the Chief Information Officer (OCIO), the National Protection and Programs Directorate (NPPD), the Science and Technology Directorate (S&T), the United States Coast Guard (USCG), and the United States Secret Service (USSS). All of these individual Components work together with the Department of Defense (DOD) to protect American interests from cybersecurity threats. As an ongoing, collaborative process, the level of cybersecurity cooperation between DHS Components and DOD continues to grow in depth, breadth, and scope."
Department of Homeland Security: https://www.dhs.gov/