; (2) an approach for comparing competing analyses and conducting joint analyses for force structure to support senior leaders in implementing the National Defense Strategy; (3) a determination of the analytic products and support required to implement the National Defense Strategy, including the ability to update these products to reflect current strategy, intelligence assessments, and future threats; and (4) such other matters as the Secretary of Defense determines to be appropriate. (c) Briefing required Not later than March 1, 2020, the Secretary of Defense shall provide to the congressional defense committees a briefing on the plan under subsection (a). 6. Extension and additional duties of the Commission on the National Defense Strategy for the United States Section 942 of the National Defense Authorization Act for Fiscal Year 2017 ( Public Law 114–328 ; 130 Stat. 2367) is amended— (1) by amending subsection (f) to read as follows: (f) Annual update on national defense strategy (1) In general On an annual basis during the covered period, the chair and vice chair of the Commission, or their designees, shall jointly submit to the congressional defense committees a report that assesses whether, and to what extent, the Department of Defense executed the National Defense Strategy in the preceding fiscal year. (2) Elements Each report submitted under paragraph (1) shall assess the performance of the Department of Defense with respect to each of the elements described in sections 4 and 5(b) of the National Defense Strategy Implementation Act . (3) Covered period defined In this subsection, the term covered period means a period that— (A) begins not later than 180 days after the date of the enactment of this subsection; and (B) ends on the date on which the first National Defense Strategy is submitted to Congress after such date of enactment. . (2) by striking subsection (g)