; (2) participating in the Maritime Security Program or the Emergency Preparedness Program under chapter 531 of title 46, United States Code, the Cable Security Fleet under chapter 532 of such title, the Tanker Security Fleet under chapter 534 of such title, or the National Defense Reserve Fleet under section 57100 of such title; and (3) with a coastwise endorsement under chapter 121 of title 46, United States Code. 6. Regulations and guidance Not later than 180 days after the date of enactment of this Act, the Administrator of the Maritime Administration shall— (1) promulgate regulations under subchapter III of chapter 5 of title 5, United States Code, to fully implement and ensure compliance with section 2631 of title 10, United States Code, and section 55305 of title 46, United States Code; and (2) issue interagency guidance to other Federal departments and agencies on how to administer the programs in accordance with such Acts and the amendments made by the this Act, which shall include publication in the Federal Register and on the website of the Maritime Administration.