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The Ohio class is a class of nuclear-powered submarines used by the United States Navy. The Navy has 18 Ohio-class ballistic missile submarines (SSBN) and guided missile submarines (SSGN).
The Ohio class is named after the lead submarine of this class, USS Ohio. The 14 Trident II SSBNs together carry approximately fifty percent of the total US active inventory of strategic thermonuclear warheads. The exact number of warheads deployed in the oceans of the world varies in an unpredictable and classified manner, always at or below a maximum number set by various Strategic Arms Reduction Treaties. Although the Trident missiles have no pre-set targets when the submarines go on patrol, the warships, when required, are capable of quickly being assigned targets by using secure and constant radio communications links at sea, including very low frequency (VLF) systems.
All the Ohio-class submarines, except for the USS Henry M. Jackson (SSBN-730), are named for U.S. states, which until that point was a tradition reserved for battleships and cruisers.
The Ohio-class submarines are the largest submarines ever built for the U.S. Navy. Two classes of the Russian Navy's submarines have larger total displacements: the Soviet-designed Typhoon-class submarines have more than twice the total displacement, and the Russian Federation's Borei-class submarines have roughly 25 percent greater displacement, but the Ohio-class warships carry more missiles and warheads than either of the other designs: 24 Trident missiles per boat, versus only 16 missiles for the Borei class (20 for the Borei II) and 20 for the Typhoon-class.
|Builders:||General Dynamics Electric Boat
United States Navy
|Preceded by:||Benjamin Franklin class|
|Type:||SSBN/SSGN (hull design SCB-304)
|Displacement:||16,764 tonnes (16,499 long tons) surfaced
18,750 tonnes (18,450 long tons) submerged
|Length:||560 ft (170 m)
|Beam:||42 ft (13 m)
|Draft:||35.5 ft (10.8 m) maximum
|Propulsion:||1× S8G PWR nuclear reactor
2× geared turbines; 60,000 shp (45 MW) Fairbanks Morse auxiliary diesel
1× 325 hp (242 kW) auxiliary motor
1 shaft with seven-bladed screw
|Speed:||12 knots (22 km/h; 14 mph) surfaced
20 knots (37 km/h; 23 mph) submerged (official)
25 knots (46 km/h; 29 mph) submerged (reported)
|Range:||Limited only by food supplies|
|Test depth:||+800 ft (240 m)|
|Crew:||15 officers, 140 enlisted
|BQQ-6 passive bow-mounted array(which includes BQS-13 fire control array)
TB-16 or BQR-23 towed array
BQR-25 conformal array
|Armament:||4 × 21 in (53 cm) Mark 48 torpedo tubes (midships)|
|General characteristics SSBN-726 to SSBN-733 from construction to refueling|
|Armament:||24 × Trident I C4 SLBM with up to 8 MIRVed 100 ktTNT W76 nuclear warheads each, range 4,000 nmi (7,400 km; 4,600 mi)|
|General characteristics SSBN-734 and subsequent hulls upon construction, SSBN-730 to SSBN-733 since refueling|
|Armament:||24 × Trident II D5 SLBM with up to 12 MIRVed W76 or W88 (300–475 ktTNT) nuclear warheads each, range 6,500 nmi (12,000 km; 7,500 mi)|
|General characteristics SSGN conversion|
|Armament:||22 tubes, each with 7 Tomahawk cruise missiles, totaling 154|
The Ohio-class submarines were designed specifically for extended war-deterrence patrols. Each of these submarines is provided with two complete crews, called the Blue crew and the Gold crew, with each crew serving typically on 70- to 90-day deterrent patrols. To decrease the time in port for crew turnover and replenishment, three large logistics hatches have been installed to provide large-diameter resupply and repair access. These hatches allow rapid transfer of supply pallets, equipment replacement modules, and machinery components, significantly reducing the time required for replenishment and maintenance of the submarines.
The class's design allows the warship to operate for about fifteen years between major overhauls. These submarines are reported to be as quiet at their cruising speed of 20 knots (37 km/h; 23 mph) or more than the previous Lafayette-class submarines were at 6 knots (11 km/h; 6.9 mph), although exact information remains classified. Fire control for their Mark 48 torpedoes is carried out by Mark 118 Mod 2 system, while the Missile Fire Control (MFC) system is a Mark 98.
The Ohio-class submarines were constructed from sections of hull, with each four-deck section being 42 ft (13 m) in diameter. The sections were produced at General Dynamics Electric Boat's Quonset Point, Rhode Island facility, and then assembled at their Groton, Connecticut shipyard.
The US Navy has a total of 18 Ohio-class submarines which consist of 14 ballistic missile submarines (SSBNs), and four cruise missile submarines (SSGNs). The SSBN submarines are also known as "Trident" submarines, and provide the sea-based leg of the US's nuclear triad. Each SSBN submarine is armed with up to 24 Trident II submarine-launched ballistic missiles (SLBM). Each SSGN is capable of carrying 154 Tomahawk cruise missiles with either conventional or nuclear warheads, plus a complement of Harpoon missiles to be fired through their torpedo tubes.
Note: The classification of the 18 boats into the two U.S. fleets is according to the latest updates of the Naval Vessel Register, and does not indicate previous boat transfers between the two fleets.
|Boat||Hull number||UIC||Picture||Ordered||Laid down||Launched||Commissioned||Weapons|
|Ohio||SSGN-726 (ex SSBN-726)||21036||1 July 1974||10 April 1976||7 April 1979||11 November 1981||154 Tomahawk cruise missiles;Mark 48 torpedoes
|Michigan||SSGN-727 (ex SSBN-727)||21037||28 February 1975||4 April 1977||26 April 1980||11 September 1982||154 Tomahawk cruise missiles;Mark 48 torpedoes|
|Florida||SSGN-728 (ex SSBN-728)||21038||28 February 1975||19 January 1981||14 November 1981||18 June 1983||154 Tomahawk cruise missiles;Mark 48 torpedoes|
|Georgia||SSGN-729 (ex SSBN-729)||21039||20 February 1976||7 April 1979||6 November 1982||11 February 1984||154 Tomahawk cruise missiles;Mark 48 torpedoes|
|Henry M. Jackson(ex Rhode Island)||SSBN-730||21040||6 June 1977||19 November 1981||15 October 1983||16 October 1984||24 UGM-133 Trident II SLBMs; Mark 48 torpedoes
|Alabama||SSBN-731||21041||27 February 1978||27 August 1981||19 May 1984||25 May 1985||24 UGM-133 Trident II SLBMs; Mark 48 torpedoes|
|Alaska||SSBN-732||21042||27 February 1978||9 March 1983||12 January 1985||25 January 1986||24 UGM-133 Trident II SLBMs; Mark 48 torpedoes|
|Nevada||SSBN-733||21043||7 January 1981||8 August 1983||14 September 1985||16 August 1986||24 UGM-133 Trident II SLBMs; Mark 48 torpedoes|
|Tennessee||SSBN-734||21044||7 January 1982||9 June 1986||13 December 1986||17 December 1988||24 UGM-133 Trident II SLBMs; Mark 48 torpedoes|
|Pennsylvania||SSBN-735||21045||29 November 1982||2 March 1987||23 April 1988||9 September 1989||24 UGM-133 Trident II SLBMs; Mark 48 torpedoes|
|West Virginia||SSBN-736||21365||21 November 1983||18 December 1987||14 October 1989||20 October 1990||24 UGM-133 Trident II SLBMs; Mark 48 torpedoes|
|Kentucky||SSBN-737||21433||13 August 1985||18 December 1987||11 August 1990||13 July 1991||24 UGM-133 Trident II SLBMs; Mark 48 torpedoes|
|Maryland||SSBN-738||21460||14 March 1986||22 April 1986||10 August 1991||13 June 1992||24 UGM-133 Trident II SLBMs; Mark 48 torpedoes|
|Nebraska||SSBN-739||21461||26 May 1987||6 July 1987||15 August 1992||10 July 1993||24 UGM-133 Trident II SLBMs; Mark 48 torpedoes|
|Rhode Island||SSBN-740||21682||15 January 1988||15 September 1988||17 July 1993||9 July 1994||24 UGM-133 Trident II SLBMs; Mark 48 torpedoes|
|Maine||SSBN-741||21826||5 October 1988||3 July 1990||16 July 1994||29 July 1995||24 UGM-133 Trident II SLBMs; Mark 48 torpedoes|
|Wyoming||SSBN-742||21846||18 October 1989||8 August 1991||15 July 1995||13 July 1996||24 UGM-133 Trident II SLBMs; Mark 48 torpedoes|
|Louisiana||SSBN-743||21861||19 December 1990||23 October 1992||27 July 1996||6 September 1997||24 UGM-133 Trident II SLBMs; Mark 48 torpedoes|
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