USS Louisiana - Ohio-Class submarine

The Ohio class of nuclear-powered submarines includes the United States Navys 14 ballistic missile submarines (SSBNs) and its four cruise missile submarines (SSGNs). Each displacing 18,750 tons submerged, the Ohio-class boats are the largest submarines ever built for the U.S. Navy. They are the worlds third-largest submarines, behind the Russian Navys Soviet-designed 48,000-ton Typhoon class[8] and 24,000-ton Borei class[9]. The Ohios carry more missiles than either: 24 Trident II missiles apiece, versus 16 by the Borei class (20 by the Borei II) and 20 by the Typhoon class.