review. (d) Updated review (1) In general Not less frequently than once every two years after the initial review conducted under subsection (a), the Secretary of Defense shall conduct an updated review under such subsection, including consideration of the matters set forth under subsection (b), and update training guidance under subsection (c). (2) Consideration of new research and evidence Each updated review conducted under paragraph (1) shall take into account new research and evidence that has emerged since the previous review. (e) Briefing required The Secretary of Defense shall brief the Committees on Armed Services of the Senate and the House of Representatives on a summary of the results of the initial review under subsection (a), each updated review conducted under subsection (d), and any updates to training guidance and procedures resulting from any such review or updated review. 239. List of technologies and manufacturing capabilities critical to Armed Forces (a) List required The Secretary of Defense shall develop a list of technologies and manufacturing capabilities critical to the Armed Forces. (b) Primary emphasis In developing such list, primary emphasis shall be given to— (1) research, development, design, and manufacturing expertise