The document describes how Zero Trust principles are being adapted to the realities of operational technology that supports defense infrastructure, such as power distribution, water treatment, building systems, transportation, and manufacturing control environments. Instead of simply copying enterprise IT guidance, it lays out OT-specific activities and outcomes that account for safety-critical processes, legacy devices, industrial protocols, and the need to keep systems running continuously. The approach emphasizes strong identity and access management, granular segmentation, continuous monitoring, and better visibility into assets and behaviors, but always with careful risk assessment so that security changes do not disrupt operations.

The guidance is designed to align tightly with the existing Zero Trust framework for enterprise IT, creating a common language and interoperable set of expectations across both worlds. It encourages phased integration where OT tools for credentialing, asset management, threat detection, and analytics can eventually connect into enterprise platforms while still respecting local constraints. Only those who are directly responsible for OT environments, working together with OT operators and security professionals, are meant to tailor and apply these activities, documenting where certain measures are not feasible. In this way, the document becomes a foundation for systematically raising Zero Trust maturity across defense OT systems without sacrificing availability or safety.

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Source: https://industrialcyber.co/zero-trust/dows-zt-for-ot-activities-and-outcomes-document-sets-foundation-for-zero-trust-across-defense-infrastructure/