For more than 60 years, 75% of Vieques, an island municipality of Puerto Rico, were used by the US Navy as military practice grounds. Though the US forces left Vieques in 2003, after historical protests due to a detonation that killed a civilian, hundreds of acres of la Isla Nena are stilled polluted. Terrains are contaminated with undetonated munitions and bombs, as well as with toxic chemicals.