; 10 U.S.C. 111 note), to develop and direct the implementation of a threat-driven cyber defense construct for systems and networks that support the nuclear command, control, and communications (commonly referred to as NC3 ) mission. (2) Participation in the cross-functional team The Secretary shall ensure that each of the military departments, the Defense Information Systems Agency, the National Security Agency, United States Cyber Command, and the Nuclear Command, Control, and Communications Enterprise Center of United States Strategic Command provide staff for the cross-functional team. (3) Scope The cross-functional team shall work to enhance the cyber defense of the nuclear command, control, and communications network during the period beginning on the date of the enactment of this Act and ending on October 31, 2028, or a subsequent date as the Secretary may determine. (b) Required construct and plan of action and milestones Not later than one year after the date of the enactment of this Act, the head of the cross-functional team established pursuant to subsection (a)(1) shall develop a cyber defense construct and associated plans of actions and milestones to enhance the security of the systems and networks that support the nuclear command, control, and communications mission that are based on— (1) the application of the principles of the Zero Trust Architecture approach to security; (2) analysis of appropriately comprehensive endpoint and network telemetry data