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This paper presents the approach to accommodate the secure information sharing initiative via the development of the community enterprise architectures. The effort was initiated by the DoD CIO and the DNI CIO where they jointly established the Unified Cross Domain Office (UCDMO) to develop a roadmap for the community and facilitate the development of a Cross Domain vision that includes all the stakeholders and their stated mission. The UCDMO took the lead in working with the different commands and agencies to collect the needs and summarize them into 31 main needs. The most important capabilities that have the highest impact to the community were then determined. Ultimately, the overall mission needs led the UCDMO to determine the need to develop a Secure information sharing environment that can accommodate real-time information access and transfer between different agencies. It was concluded that an enterprise architecture that is based on SOA principles is best suited to achieve this mission.