; (B) that contains recommended best practices for the procurement of unmanned aircraft systems; and (C) that lists— (i) the number and type of each unmanned aircraft system for which a waiver under subsection (b)(1) was granted during the 2-year period prior to the submission of the report; and (ii) the legal authority under which each such waiver was granted, such as whether the waiver was granted pursuant to subparagraph (A), (B), or (C) of subsection (b). (2) Classification of report Each report submitted under this subsection shall be submitted in unclassified form, but may include— (A) a classified annex that contains the information described in paragraph (1)(C); and (B) a committee-use only annex that contains information described in paragraph (1)(C) that is law enforcement sensitive. (d) Effective date The prohibition under subsection (a)(1) shall take effect on the date that is 2 years after the date of enactment of this Act. 6. Government Accountability Office report on cybersecurity considerations of unmanned aircraft systems (a) Briefing Not later than 1 year after the date of enactment of this Act, the Comptroller General of the United States shall provide a briefing to the Committee on Homeland Security and Governmental Affairs of the Senate, the Committee on Oversight and Accountability of the House of Representatives, and the Committee on Homeland Security of the House of Representatives on broader unmanned aircraft system cybersecurity efforts. (b) Report Not later than 2 years after the date of enactment of this Act, the Comptroller General of the United States shall submit to the Committee on Homeland Security and Governmental Affairs of the Senate, the Committee on Oversight and Accountability of the House of Representatives, and the Committee on Homeland Security of the House of Representatives a report on broader unmanned aircraft system cybersecurity efforts addressed in the briefing required under subsection (a).