Puerto Ricans, angered by the US Navy’s bombing exercises on Vieques, took their protest to the United Nations yesterday, demanding that Washington halt its military maneuvers and recognize Puerto Rico’s right to independence. Puerto Rican Independence Party Vice President Fernando Martin demanded an end to what he called the grotesque repression that Washington unleashed on the people of Puerto Rico when US marshals arrested demonstrators who occupied the firing range in an effort to halt the Navy’s live fire exercises.