The Navy this week plans to hold its largest bombing practice on Puerto Rico’s Vieques Island since exercises were suspended last year. Documents about the Navy’s plans were released today by Puerto Rico’s Planning Board. According to the documents, five ships from the USS George Washington battle group will fire as many as 600 rounds onto the Navy’s range starting Wednesday. Aircraft will drop between 550 and 830 so-called dummy bombs during the exercise, which could last two to five days. Activists bitterly oppose the Navy’s use of Vieques and blame its operations for environmental damage and a high rate of cancer among residents. Two stray bombs killed a civilian security guard on the range last year. Today, outside the White House, a press conference will be held by Hector Rosario, a Dartmouth graduate student who is on a hunger fast protesting the bombing of Vieques.