; and (C) by striking subsection (c). (d) Reduction of lengths of certain periods of service (1) In general Title 46, United States Code, is amended as follows: (A) Section 7307 is amended by striking 3 years and inserting 18 months . (B) Section 7308 is amended by striking 18 months and inserting 12 months . (C) Section 7309 is amended by striking 12 months and inserting 6 months . (2) Temporary reduction of lengths of certain periods of service Section 3534(j) of the National Defense Authorization Act for Fiscal Year 2024 ( Public Law 118–31 ) is repealed. (e) Merchant mariner credentials Section 7510 of title 46, United States Code, is amended by striking subsection (d). (f) Implementation The Secretary of the department in which the Coast Guard is operating shall implement the amended requirements under subsections (c)(3), (c)(4), and (c)(6) of this section without regard to chapters 5 and 6 of title 5, United States Code, and Executive Orders 12866 and 13563 ( 5 U.S.C. 601 note). 312. Amendments (a) Merchant mariner Credentials The heading for part E of subtitle II of title 46, United States Code, is amended by striking MERCHANT SEAMEN LICENSES, CERTIFICATES, AND DOCUMENTS and inserting MERCHANT MARINER CREDENTIALS . (b) Able seafarers—unlimited (1) In general The section heading for section 7307 of title 46, United States Code, is amended by striking seamen and inserting seafarers . (2) Clerical amendment The analysis for chapter 73 of title 46, United States Code, is further amended in the item relating to section 7307 by striking seamen and inserting seafarers . (c) Able seamen—limited (1) In general The section heading for section 7308 of title 46, United States Code, is amended by striking seamen and inserting seafarers . (2) Clerical amendment The analysis for chapter 73 of title 46, United States Code, is further amended in the item relating to section 7308 by striking seamen and inserting seafarers . (d) Able seafarers—special (1) In general The section heading for section 7309 of title 46, United