The local government of Puerto Rico has requested several times to the U.S. Congress to exclude Puerto Rico from the Jones Act restrictions without success. The most recent measure has been taken by the 17th Legislative Assembly of Puerto Rico through R. Conc. del S. 21. These measures have always received support from all the major local political parties. In 2013 the Government Accountability Office published a report which concluded that "repealing or amending the Jones Act cabotage law might cut Puerto Rico shipping costs" and that "shippers believed that opening the trade to non-U.S.-flag competition could lower costs." The report, however, concluded that the effects of modifying the application of the Jones Act for Puerto Rico are highly uncertain for both Puerto Rico and the United States, particularly for the U.S. shipping industry and the military preparedness of the United States.