by the Secretary. 13. Definitions In this Act: (1) Lifting operations The term lifting operations means self-propelled movements by a vessel when using a crane, or other similar equipment, to install or remove merchandise on or from offshore facilities or subsea infrastructure. (2) Merchandise The term merchandise has the meaning given such term in section 55102(a) of title 46, United States Code. (3) Oceanographic research vessel The term oceanographic research vessel has the meaning given such term in section 2101 of title 46, United States Code. (4) Outer Continental Shelf The term outer Continental Shelf has the meaning given such term in section 2 of the Outer Continental Shelf Lands Act ( 43 U.S.C. 1331 ). (5) Ruling letter The term ruling letter means any ruling letter or headquarters ruling letter relating to the enforcement of chapters 121 and 551 of title 46, United States Code (commonly referred to as the Jones Act ), issued by the Commissioner of U.S. Customs and Border Protection pursuant to sections 502(a) or 625 of the Tariff Act of 1930 ( 19 U.S.C. 1502(a) and 1625). (6) Secretary The term Secretary means the Secretary of Homeland Security, acting through the Commissioner of U.S. Customs and Border Protection.