. . . . "the term ???person??? means any public or private agency, institution, association, partnership, corporation, political subdivision, or other legal entity which is a United States citizen as determined by application of the test for United States citizenship contained in section 50501 of title 46, or in the first sentence of section 27A of the Merchant Marine Act, 1920 (46 U.S.C. 883???1(a)???(e))" . .