the guidelines with respect to unmanned aircraft systems owned or controlled by the agency. (B) Exception A pilot implementation under subparagraph (A) shall not apply to any unmanned aircraft system comprised of any national security system. (2) Policies and principles Not later than 1 year after the conclusion of the pilot implementation under paragraph (1)(A), the Director shall issue policies and principles necessary to ensure that the policies and principles of each agency relating to the cybersecurity of unmanned aircraft systems are consistent with the guidelines developed under subsection (a). (3) National security systems Any policy or principle issued by the Director under paragraph (2) shall not apply to national security systems. (c) Quinquennial review and revision (1) Review and revision of NIST guidelines Not later than 5 years after the date on which the Under Secretary publishes the guidelines under subsection (a), and not less frequently than once every 5 years thereafter, the Under Secretary, shall— (A) review such guidelines