; and (10) a description of any other matters deemed relevant by the Chairman of the Joint Chiefs of Staff. 1073. Limitation on certain funding until submission of the Chairman’s Risk Assessment and briefing requirement (a) Office of the Chairman of the Joint Chiefs of Staff Of the amounts authorized to be appropriated by this Act for fiscal year 2024 for operation and maintenance, Defense-wide, and available for the Office of the Chairman of the Joint Chiefs of Staff, not more than 50 percent may be obligated or expended until the date that is 15 days after the date on which the following reports are submitted to the Committees on Armed Services of the Senate and the House of Representatives: (1) The 2021 risk assessment mandated by paragraph (2) of subsection (b) of section 153 of title 10, United States Code, and required to be delivered pursuant to paragraph (3) of such subsection by not later than February 15, 2021. (2) The 2023 risk assessment mandated by paragraph (2) of subsection (b) of section 153 of title 10, United States Code, and required to be delivered pursuant to paragraph (3) of such subsection by not later than February 15, 2023. (b) Office of the Secretary of Defense Of the amounts authorized to be appropriated by this Act for fiscal year 2024 for operation and maintenance, Defense-wide, and available for the Office of the Secretary of Defense, not more than 50 percent may be obligated or expended until the date that is 15 days after the date on which the Secretary submits to the Committees on Armed Services of the Senate and the House of Representatives: (1) The risk mitigation plan required to be submitted as part of the assessment described under subsection (a)(1), if applicable. (2) The risk mitigation plan required to be submitted as part of the assessment described under subsection (a)(2), if applicable. (c) Briefing requirement Section 153 of title 10, United States Code, is amended by adding at the end the following new subsection: (d) Briefing requirement (1) Not later than 15 days