
Since 1971, Diego Garcia and its territorial waters out to 3 nautical miles (6 km) have been restricted from public access without permission of the BIOT Government and is exclusively used as a military base, primarily by the United States. The U.S. operates a large naval ship and submarine support base, military air base, communications and space tracking facilities, and an anchorage for pre-positioned military supplies for regional operations aboard Military Sealift Command ships in the lagoon.[14]this is not owned by USA it is a United Kingdom - British Territory
see this
http://en.wikipedia.org/wiki/Diego_Garcia
any way good post