; and (2) in subsection (f), by striking on the use of funds under and inserting in . 1623. Limitation on use of funds until provision of Department of Defense information to Government Accountability Office Of the funds authorized to be appropriated by this Act for fiscal year 2024 for Operation and Maintenance, Defense-wide, and available for the Office of the Under Secretary of Defense for Policy, not more than 50 percent may be obligated or expended until the date on which the Comptroller General of the United States notifies the congressional defense committees that the Secretary of Defense has fully complied with information requests by the Government Accountability Office with respect to the conduct of the study required by section 1652 of the National Defense Authorization Act for Fiscal Year 2022 ( Public Law 117–81 ; 135 Stat. 2100). 1624. Monitoring Iranian enrichment (a) Significant enrichment activity defined In this section, the term significant enrichment activity means— (1) any enrichment of any amount of uranium–235 to a purity percentage that is 5 percent higher than the purity percentage indicated in the prior submission to Congress under subsection (b)(1)