; and (B) any other country determined by the Secretary of Defense to be a geostrategic competitor or adversary of the United States for purposes of this Act. (3) Critical mineral The term critical mineral means a critical mineral (as defined in section 7002(a) of the Energy Act of 2020 ( 30 U.S.C. 1606(a) )) that the Secretary of Defense determines to be important to the national security of the United States for purposes of this Act. (4) Shortfall material The term shortfall material means materials determined to be in shortfall in the most recent report on stockpile requirements submitted to Congress under subsection (a) of section 14 of the Strategic and Critical Materials Stock Piling Act ( 50 U.S.C. 98h–5 ) and included in the most recent briefing required by subsection (f) of that section. 1058. Quarterly briefing on homeland defense planning (a) In general Not later than February 1, 2024, and every 90 days thereafter through February 1, 2026, the Secretary of Defense shall provide a briefing to the congressional defense committees on efforts to bolster homeland defense, which is the top priority under the 2022 National Defense Strategy. (b) Contents Each briefing required by subsection (a) shall include the following: (1) A summary of any update made to the homeland defense planning guidance of the Department of Defense during the preceding quarter. (2) An update on the latest threats to the homeland posed by the Government of the People's Republic of China, the Government of the Russian Federation, the Government of the Democratic People's Republic of Korea, the Government of Iran, and any other adversary. (3) A description of actions taken by the Department during the preceding quarter to mitigate such threats. (4) An assessment of threats to the homeland in the event of a conflict with any adversary referred to in paragraph (2). (5) A description of actions taken by the Department during the preceding quarter to bolster homeland defense in the event of such a conflict. (6) An update on coordination by