The Information Assurance Directorate (IAD) within the National Security Agency (NSA) is charged in part with providing security guidance to the national security community. Within the IAD, the Vulnerability Analysis and Operations (VAO) Group identifies and analyzes vulnerabilities found in the technology, information, and operations of the Department of Defense (DoD) and our other federal customers. This presentation will highlight some of the ways that the VAO Group is translating vulnerability knowledge in cooperation with many partners, into countermeasures and solutions that scale across the entire community. This includes the development and release of security guidance through the NSA public website (www.nsa.gov) and sponsorship of a number of community events like the Cyber Defense Initiative and the Red Blue Symposium. It also includes support for, or development of, open standards for vulnerability information (like CVE, the standard naming scheme for vulnerabilities); the creation of the extensible Configuration Checklist Description Format (XCCDF) to automate the implementation and measurement of security guidance; and joint sponsorship, with the National Institute of Standards and Technology (NIST) and the Defense Information Systems Agency (DISA), of the Information Security Automation Program (ISAP), to help security professionals automate security compliance and manage vulnerabilities. The presentation will also discuss the cultural shift we have been making to treat network security as a community problem, one that requires large ≠scale openness and cooperation with security stakeholders at all points in the security supply chain ≠ operators, suppliers, buyers, authorities and practitioners.