P.L. 83-644 (August 26, 1954), as amended, contains permanent legislation concerning the transportation of waterborne cargoes in U.S.-flag vessels. The Act requires that 75% of the volume of U.S. agricultural commodities financed under P.L. 480 and other concessional financing arrangements be shipped on privately owned U.S.-registered vessels. Maritime interests generally support cargo preference, but proponents of P.L. 480 argue that it increases the costs of shipping U.S. commodities to poor countries and potentially reduces the volume of food aid that is provided.