PRI | Vieques Island Training Area
https://www.openstreetbrowser.org/#map=11/18.1491/-65.3045&categories=military 18.129612, -65.411158
Wikipedia EN: https://en.wikipedia.org/wiki/Vieques,_Puerto_Rico
Environmental impact: Training area closed 2003 after heavy protests because of health exposure caused from a lot of chemicals.