Defense Authorization Act for Fiscal Year 2018 ( Public Law 115–232 ) is amended by striking December 31, 2019 and inserting December 31, 2020 . 1024. Extension of prohibition on use of funds to close or relinquish control of United States Naval Station, Guantanamo Bay, Cuba Section 1036 of the National Defense Authorization Act for Fiscal Year 2018 ( Public Law 115–91