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US operating five submarines in Persian Gulf
The number of US submarines deployed to the Persian Gulf and the Sea of Oman has reached five with the dispatch of the USS Springfield (SSN-761) to the region, Press TV reported.
And they would know this ... how?
The USS Columbia (SSN-771) is operating west of the Strait of Hormuz, which is a key oil transit route. The US has also stationed eight minesweeping ships in international waters of the Persian Gulf and the Sea of Oman.

The United Kingdom has also deployed HMS Trenchant, a Trafalgar-class nuclear-powered submarine, to the Sea of Oman.
Posted by: Steve White 2013-03-07
http://www.rantburg.com/poparticle.php?ID=363650