; and (B) align the reorientation effort under an existing line of effort of the Cyber Strategy of the Department of Defense. (2) Oversight of implementation The Secretary shall act through the Principal Cyber Advisor and the supporting Cross Functional Team in the oversight of the implementation of paragraph (1). (b) Common baseline and security classification scheme (1) In general Not later than January 1, 2021, the Secretary shall establish a common baseline and security classification scheme for the collection, storage, processing, querying, analysis, and accessibility of a common and comprehensive set of metadata from sensors, applications, appliances, products, and systems deployed across the Department of Defense Information Network (DODIN) to enable the discovery, tracking, and remediation of cybersecurity threats. (2) Requirements In carrying out paragraph (1), the Secretary shall— (A) take such actions as the Secretary considers necessary to standardize deployed infrastructure, including the Department of Defense’s perimeter capabilities at the Internet Access Points and the Joint Regional Security Stacks, and the routing of data laterally and vertically from Department of Defense Information Network segments and tiers, to enable standard and comprehensive metadata collection; (B) take such actions as the Secretary considers necessary to standardize deployed cybersecurity applications, products, and sensors and the routing of data laterally and vertically from Department of Defense Information Network segments and tiers, to enable standard and comprehensive metadata collection; (C) develop an enterprise-wide architecture and strategy for— (i) where to place sensors or extract data from network information technology, operational technology, and cybersecurity appliances, applications, products, and systems for cybersecurity purposes; (ii) which metadata data records should be universally sent to Big Data Platform instances and which metadata data records, if any, should be locally retained