; and (2) provide the congressional defense committees with a briefing on such in-progress reviews. (i) Final briefing After all of the reviews have been completed under paragraph (1) of subsection (a), after receiving all of the findings pursuant to paragraph (2) of such subsection, and not later than June 1, 2021, the Principal Cyber Advisor, the Chief Information Officer, and the Under Secretary shall jointly provide to the congressional defense committees a briefing on the findings of the Principal Cyber Advisor, the Chief Information Officer, and the Under Secretary with respect to such reviews, including such recommendations as the Principal Cyber Advisor, the Chief Information Officer, and the Under Secretary may have for changes to the budget of the Department as a result of such reviews. (j) Definition of zero-based review In this section, the term zero-based review means a review in which assessment is conducted with each item, position, or person costed anew, rather than in relation to its size or status in any previous budget. 1633. Study on improving cyber career paths in the Navy (a) Study required Not later than October 1, 2020, the Secretary of the Navy and the Chief of Naval Operations shall jointly— (1) complete a study on methods to improve military and civilian cyber career paths within the Navy