under such chapter. (b) Oceanographic research vessel clarification Section 50503 of title 46, United States Code is amended by inserting , except that any vessel engaging in commercial research activities to directly support the exploration for, or development, production, transportation, or transmission of, resources, including non-mineral energy resources, from a planning or leasing area designated by the Secretary of the Interior under the Outer Continental Shelf Lands Act ( 43 U.S.C. 1331 et seq. ) may be determined to be engaged in trade or commerce under this section after trade or commerce . (c) Designation The Commandant of the Coast Guard shall deny any request from a foreign vessel to be designated as an oceanographic research vessel for any such vessel engaging in commercial research activities to directly support the exploration for, or development, production, transportation, or transmission of, resources, including non-mineral energy resources, from a planning or leasing area designated by the Secretary of the Interior under the Outer Continental Shelf Lands Act ( 43 U.S.C. 1331 et seq. ). (d) Revocation or modification of certain ruling letters (1) In general The Secretary shall revoke or modify, as appropriate, the following headquarters ruling letters: (A) HQ H216579 (May 15, 2012). (B) HQ H205655 (March 20, 2012). (C) HQ 112830 (August 12, 1993). (D) HQ 110364 (September 29, 1989). (2) Substantially identical transatcions The Secretary shall revoke or modify, as appropriate, any treatments, including ruling letters, accorded by the Secretary to transactions that are substantially identical to the transactions described in the ruling letters listed in paragraph (1). 5. U.S. Customs and Border Protection rulings (a) Vessel equipment (1) In general In enforcing chapter 551 of title 46, United States Code, the Secretary may not apply an interpretation of the terms vessel equipment or equipment that conflicts with the definition of the term merchandise or sections 55105, 55106, 55107, 55108, 55110,