NSA, CISA, EPA, FBI, and allied cyber agencies just published prescriptive guidance for building and maintaining an OT asset inventory and taxonomy—the foundation for a modern, defensible OT architecture. If you already run RedSeal, you can fulfill most of the guidance quickly by modeling your hybrid networks, auto-grouping assets into OT zones, validating segmentation, and continuously monitoring drift. If you don’t have RedSeal, you can still make rapid progress with a pragmatic, manual-first playbook and a tight operating cadence.