later than 30 days after the date of the enactment of this Act, and every 180 days thereafter through February 1, 2026, the Secretary of Defense shall provide to the congressional defense committees a briefing on efforts to bolster homeland defense. (b) Contents (1) First briefing The first briefing required by subsection (a) shall include each of the following: (A) A detailed description of the homeland defense policy guidance. (B) The assumptions used in the drafting of such guidance. (C) If such guidance has not been completed, an explanation of the reasons for the lack of completion and a timeline for completion. (2) All briefings Each briefing required under subsection (a) shall include each of the following: (A) A summary of any update made to the homeland defense policy guidance. (B) An update on threats to the United States emanating from 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 country, as determined by the Secretary. (C) A description of major actions taken by the Department during the preceding fiscal year to respond to and mitigate military threats to the United States. (D) A description of the homeland defense policies of the Department in the event of a military conflict with the People’s Republic of China, the Russian Federation, the Democratic People’s Republic of Korea, the Islamic Republic of Iran, or any other country as determined by the Secretary. (E) Any other matter the Secretary considers relevant. 1073. Report on effectiveness of current use of United States Naval Station, Guantanamo Bay, Cuba (a) In general Not later than April 30, 2024, the Secretary of Defense shall submit to the Committees on Armed Services of the Senate and House of Representatives a report on the extent to which United States Naval Station, Guantanamo Bay, Cuba, is being used effectively to defend the national security interests of the United States. (b)