Each SSGN is capable of carrying 154 Tomahawk cruise missiles, plus a complement of Harpoon missiles to be fired through their torpedo tubes. As part of the New START treaty, four tubes on each SSBN will be deactivated, leaving each ship with only 20 available for war loads. == History == The Ohio class was designed in the 1970s to carry the concurrently designed Trident submarine-launched ballistic missile.
Ohio was virtually undetectable in her sea trials in 1982, giving the U.S.
The remaining 10 submarines originally had their home ports at Kings Bay, Georgia, replacing the Poseidon and Trident Backfit submarines of the Atlantic Fleet. === SSBN/SSGN conversions === In 1994, the Nuclear Posture Review study determined that, of the 18 Ohio SSBNs the U.S.
Starting with in 2000, the Navy began converting its remaining ballistic missile submarines armed with C4 missiles to carry D5 missiles.
As a result, the four oldest boats of the class—Ohio, Michigan, Florida, and Georgia—progressively entered the conversion process in late 2002 and were returned to active service by 2008.
As a result, the four oldest boats of the class—Ohio, Michigan, Florida, and Georgia—progressively entered the conversion process in late 2002 and were returned to active service by 2008.
Further transfers occur as the strategic weapons goals of the United States change. In 2011, Ohio-class submarines carried out 28 deterrent patrols.
From January to June 2014, Pennsylvania carried out a 140-day-long patrol, the longest to date. The conversion modified 22 of the 24 diameter Trident missile tubes to contain large vertical launch systems, one configuration of which may be a cluster of seven Tomahawk cruise missiles.
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