; 10 U.S.C. 111 note), the Secretary of Defense shall establish a cross-functional team to develop and direct the implementation of a threat-driven cyber defense construct for the systems and networks that support the nuclear command, control, and communications (commonly referred to as NC3 ) mission (in this section referred to as the cross-functional team ). (2) Composition of cross-functional team (A) In general The cross functional team shall be composed of senior officers selected from among each of the military departments, the Defense Information Systems Agency, the National Security Agency, the United States Cyber Command, the United States Strategic Command, and any other organization or element of the Department of Defense determined appropriate by the Secretary. (B) Leadership The Secretary shall designate a senior officer from those selected under subparagraph (A) to serve as the leader of the cross-functional team. (C) Staff The Secretary shall ensure the heads of the organizations and elements specified in subparagraph (A) detail staff to support the cross-functional team in carrying out the duties under paragraph (3). (3) Duties The duties of the cross-functional team shall be to enhance the cyber defense of the systems and networks that support the nuclear command, control, and communications mission. (b) Required construct, plan of action, and milestones Not later than one year after the date of the enactment of this Act, the leader of the cross-functional team designated pursuant to subsection (a)(2)(B) shall develop a threat-driven cyber defense construct, and associated plans and milestones, to enhance the security of the systems and networks that support the nuclear command, control, and communications mission. Such construct shall be based on— (1) the application of the principles of the approach to cybersecurity commonly referred to as zero trust architecture ; (2) an analysis of appropriately comprehensive endpoint and network telemetry data