Is Defense Information Infrastructure (DII) Common Operating Equipment (COE) compliance still mandatory? If not, what replaced it?
DII COE compliancy is no longer a requirement and was replaced by Net-Centric Environment (NCE) per the 20 Dec 2004 DoD CIO memo and Net-Centric Data Strategy at https://acc.dau.mil/CommunityBrowser.aspx?id=528302 - per Dr. Kye DISA BDC.
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From an interoperability perspective, NCE was replaced by Joint Information Environment (JIE). The JIE is the overarching standards used to promote Cloud and other system solutions. Today, the Global Information Grid (GIG) Technical Guidance (GTG) (formally called the DISR - DoD IT Standards Registry) is the reporting mechanism to report portability and Interoperability requirements by Joint and DISA programs. DISA is currently reviewing the Cloud specific reporting requirements for the Enhanced Information Support Plan (EISP) as part of the GTG Federation. The GTG web site can be accessed at: https://gtg.csd.disa.mil .
The Federal Government U.S. Digital Services Office and the Office of Management and Budget (OMB) has a directive policy of "Cloud First" when designing an IT system. The memo says: "Each Component remains responsible for determining what data and missions are hosted by external cloud service providers per the direction below." You must perform a Business Case Analysis (BCA) per the DoD CIO memo, SUBJECT: Updated Guidance on the Acquisition and Use of Commercial Cloud Computing Services, December 15, 2014 .