The Merchant Marine Allies Partnership Act aims to enhance the participation of vessels from allied foreign countries in U.S. coastwise trade. The main objectives are to allow these vessels, which are owned and crewed by nationals of allied nations, to engage in trade within U.S. waters and to streamline the process for these vessels to operate legally in the U.S. maritime industry. Key provisions of the Act include the establishment of a Foreign Ally Shipping Registry, which will list countries considered allies of the United States for the purpose of coastwise trade.