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The Iowa-class battleships were a class of six fast battleships ordered by the United States Navy in 1939 and 1940 to escort the Fast Carrier Task Forces that would operate in the Pacific Theater of World War II. Four were completed; two more were laid down but canceled in 1945 at war's end, and both hulls were scrapped in 1958. Like other third-generation American battleships, the Iowas followed the design pattern set forth in the preceding North Carolina-class and South Dakota-class battleships, which emphasized speed in addition to secondary and anti-aircraft batteries. Based on wartime experience, they were to serve as fast escorts for Essex-class aircraft carriers.

Between the mid-1940s and the early 1990s, the Iowa-class battleships fought in four major US wars. In World War II, they defended aircraft carriers and shelled Japanese positions. During the Korean War, the battleships provided seaborne artillery support for United Nations forces fighting North Korea, and in 1968, New Jersey shelled Viet Cong and Vietnam People's Army forces in the Vietnam War. All four were reactivated and modernized at the direction of Congress in 1981, and armed with missiles during the 1980s, as part of the 600-ship Navy initiative. During Operation Desert Storm in 1991, Missouri and Wisconsin fired missiles and 16-inch (406 mm) guns at Iraqi targets.

The Navy had spent about $1.7 billion, from 1981 through 1988, to modernize and reactivate the four Iowa-class battleships. Costly to maintain, the battleships were decommissioned during the post-Cold War draw down in the early 1990s. All four were initially removed from the Naval Vessel Register; however, the United States Congress compelled the Navy to reinstate two of them on the grounds that existing naval gunfire support would be inadequate for amphibious operations. This resulted in a lengthy naval gunfire debate over whether battleships should have a role in the modern navy. Ultimately, all four ships were stricken from the Naval Vessel Register and released for donation to non-profit organizations. With the transfer of Iowa in 2012, all four are part of various non-profit maritime museums across the US.


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Background

The vessels that eventually became the Iowa-class battleships were born from the US Navy's War Plan Orange, a Pacific war plan against Japan. War planners anticipated that the US fleet would engage and advance in the Central Pacific, with a long line of communication and logistics that would be vulnerable to high-speed Japanese cruisers. The chief concern was that the US Navy's traditional 21-knot battle force would be too slow to force these Japanese task forces into battle, while faster carriers and cruiser escorts would be outmatched by the Japanese Kong?-class battlecruiser, which had been upgraded in the 1930s to fast battleships. Even during the development process of the North Carolina-class and South Dakota-class battleships, designs that could achieve 30 knots were seriously considered.

Another factor was the "escalator clause" of the Second London Naval Treaty, which raised the standard displacement limit of battleships from 35,000 tons to 45,000 tons and gun caliber from 14-inch to 16-inch. Japan refused to sign the treaty and in particular refused to accept the 14-inch gun caliber limit or the 5:5:3 ratio of warship tonnage limits for Britain, United States, and Japan respectively. This, in addition to circulation of rumors of Japanese capital ships violating naval treaties, resulted in the three treaty powers, the United States, Britain, and France, invoking the escalator clause in June 1938.


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Design

Early

Work on what would eventually become the Iowa-class battleship began on the first study in early 1938, at the direction of Admiral Thomas C. Hart, head of the General Board. It was an expanded South Dakota-class, carrying either twelve 16-inch/45 caliber Mark 6 guns or nine 18-inch (457 mm) guns -- the latter armament being dropped after the 31 March, agreement -- with more armor and a power plant large enough to drive the larger ship through the water at the same speed as the South Dakotas, 27 knots (50 km/h; 31 mph). These studies had no further impact on the design of the Iowa-class, but development of this design continued and eventually evolved into the design for the Montana class.

Another design, pursued by the Design Division section of the Bureau of Construction and Repair, was a "cruiser-killer". Beginning on 17 January 1938, under Captain A. J. Chantry, the group drew up plans for ships with twelve 16-inch and twenty 5-inch (127 mm) guns, Panamax capability but otherwise unlimited displacement, a top speed of 35 knots (65 km/h; 40 mph) and a range of 20,000 nautical miles (37,000 km; 23,000 mi) when traveling at the more economical speed of 15 knots (28 km/h; 17 mph). Their plan fulfilled these requirements with a ship of 50,940 long tons (51,760 t), but Chantry believed that more could be done if the ship were to be this large; with a displacement greater than that of most battleships, its armor would have protected it only against the 8-inch (200 mm) weapons carried by heavy cruisers.

Three improved plans--"A", "B", and "C"--were designed at the end of January. An increase in draft, vast additions to the armor, and the substitution of twelve 6-inch (152 mm) guns in the secondary battery was common between the three designs. "A" was the largest, at 59,060 long tons (60,010 t), and was the only one to still carry the twelve 16-inch guns in four triple turrets (3-gun turrets according to US Navy). It required 277,000 shp (207,000 kW) to make 32.5 knots (60.2 km/h; 37.4 mph). "B" was the smallest at 52,707 long tons (53,553 t); like "A" it had a top speed of 32.5 knots, but "B" only required 225,000 shp (168,000 kW) to make this speed. It also carried only nine 16-inch guns, in three triple turrets. "C" was similar but it added 75,000 shp (56,000 kW) (for a total of 300,000 shp (220,000 kW)), to make the original requirement of 35 knots. The weight required for this and a longer belt--512 feet (156 m), compared with 496 feet (151 m) for "B"--meant that the ship was 55,771 long tons (56,666 t).

Final

In March 1938, the General Board followed the recommendations of the Battleship Design Advisory Board, which was composed of the naval architect William Francis Gibbs, William Hovgaard (then president of New York Shipbuilding), John Metten, Joseph W. Powell, and the long-retired Admiral and former Chief of the Bureau of Ordnance Joseph Strauss. The board requested an entirely new design study, focusing on increasing the size of the 35,000 long tons (36,000 t) South Dakota-class. The first plans made for this indicated that 30 knots (56 km/h; 35 mph) was possible on a displacement of about 37,600 long tons (38,200 t). 33 knots (61 km/h; 38 mph) could be bought with 220,000 shp (160,000 kW) and a displacement of around 39,230 long tons (39,860 t), which was well below the Second London Naval Treaty's "escalator clause" maximum limit of 45,000 long tons (46,000 t).

These designs were able to convince the General Board that a reasonably well-designed and balanced 33 knot battleship was possible within the terms of the "escalator clause". However, further studies revealed major problems with the estimates. The speed of the ships meant that more freeboard would be needed both fore and amidships, the latter requiring an additional foot of armored freeboard. Along with this came the associated weight in supporting these new strains: the structure of the ship had to be reinforced and the power plant enlarged to avoid a drop in speed. In all, about 2,400 long tons (2,400 t) had to be added, and the large margin the navy designers had previously thought they had--roughly 5,000 long tons (5,100 t)--was suddenly vanishing.

With the additional displacement, the General Board was incredulous that a tonnage increase of 10,000 long tons (10,000 t) would allow only the addition of 6 knots (11 km/h; 6.9 mph) over the South Dakotas. Rather than retaining the 16-inch/45 caliber Mark 6 guns used in the South Dakotas, they ordered that future studies would have to include the more powerful (but heavier) 16-inch/50 caliber Mark 2 guns left over from the canceled Lexington-class battlecruisers and South Dakota-class battleships of the early 1920s. It also allowed the draft of the ships to be increased, meaning that the ships could be shortened (lowering weight) and the power reduced (since a narrower beam reduces drag).

The 50-caliber gun weighed some 400 long tons (410 t) more than the 45 caliber did; the barbette size also had to be increased so the total weight gain was about 2,000 long tons (2,000 t), putting the ship at a total of 46,551 long tons (47,298 t)--well over the 45,000 long ton limit. An apparent savior appeared in a Bureau of Ordnance preliminary design for a turret that could carry the 50 caliber guns in a smaller barbette. This breakthrough was shown to the General Board as part of a series of designs on 2 June 1938.

However, the Bureau of Ordnance continued working on a larger barbette design, while the Bureau of Construction and Repair utilized the smaller barbettes in the final planning of the new battleships. As the bureaus were independent of one another, they did not realize that the two plans could not go together until November 1938, when the design was in the final stages of refinement. By this time, the ships could not use the larger barbette, as it would require extensive alterations to the design and would result in substantial weight penalties. The General Board was astounded; one member asked the head of the Bureau of Ordnance if it had occurred to him that Construction and Repair would have wanted to know what turret his subordinates were working on "as a matter of common sense". A complete scrapping of plans was avoided only when designers within the Bureau of Ordnance were able to design a new 50-caliber gun, the Mark 7, that was both lighter and smaller in outside diameter; this allowed it to be placed in a turret that would fit in the smaller barbette. The redesigned 3-gun turret, equipped as it was with the Mark 7 naval gun, provided an overall weight saving of nearly 850 long tons (860 t) to the overall design of the Iowa-class.

In May 1938, the United States Congress passed the Second Vinson Act which "mandated a 20% increase in strength of the United States Navy". The act was sponsored by Carl Vinson, a Democratic Congressman from Georgia who was Chairman of the House Naval Affairs and Armed Services Committee. The Second Vinson Act updated the provisions of the Vinson-Trammell Act of 1934 and the Naval Act (1936), which had "authorized the construction of the first American battleships in 17 years", based on the provisions of the London Naval Treaty of 1930; this act provided the funding to build the Iowa-class. Each ship cost approximately US$100 million.

As 1938 drew to a close the design of the Iowas was nearly complete, but it would continuously evolve as the battleships were under construction. These revisions included changing the design of the foremast, replacing the original 1.1-inch (27.9 mm)/75-caliber guns that were to be used for anti-aircraft (AA) work with 20 mm (0.79 in)/70 caliber Oerlikon cannons and 40 mm (1.57 in)/56 caliber Bofors guns, and moving the combat information center into the armored hull. Additionally, in November 1939, the New York Navy Yard greatly modified the internal subdivision of the machinery rooms, as tests had shown the underwater protection in these rooms to be inadequate. The result of this was clearly beneficial: "The prospective effect of flooding was roughly halved and the number of uptakes and hence of openings in the third deck greatly reduced." Although the changes meant extra weight and added 1 foot (0.30 m) to the beam, this was no longer a major issue; the United Kingdom and France had renounced the Second London Naval Treaty soon after the beginning of the Second World War.


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Specifications

Armament

Main battery

The primary guns used on these battleships are the nine 16-inch (406 mm)/50-caliber Mark 7 naval guns, a compromise design developed to fit inside the barbettes. These guns fire explosive- and armor-piercing shells, and can fire a 16-inch shell approximately 23.4 nautical miles (43.3 km; 26.9 mi). The guns are housed in three 3-gun turrets: two forward of battleship's superstructure and one aft, in a configuration known as "2-A-1". The guns are 66 feet (20 m) long (50 times their 16-inch bore, or 50 calibers from breechface to muzzle). About 43 feet (13 m) protrudes from the gun house. Each gun weighs about 239,000 pounds (108,000 kg) without the breech, or 267,900 pounds (121,500 kg) with the breech. They fire projectiles weighing from 1,900 to 2,700 pounds (860 to 1,220 kg) at a maximum velocity of 2,960 ft/s (900 m/s) up to 20 miles (17 nmi; 32 km). At maximum range, the projectile spends almost 1½ minutes in flight. The maximum firing rate for each gun is two rounds per minute.

Each gun rests within an armored turret, but only the top of the turret protrudes above the main deck. The turret extends either four decks (Turrets 1 and 3) or five decks (Turret 2) down. The lower spaces contain rooms for handling the projectiles and storing the powder bags used to fire them. Each turret required a crew of between 85 and 110 men to operate. The original cost for each turret was US$1.4 million, but this figure does not take into account the cost of the guns themselves. The turrets are "three-gun", not "triple", because each barrel can be elevated independently; they can also be fired independently. The ship could fire any combination of its guns, including a broadside of all nine.

The large-caliber guns were designed to fire two different conventional 16-inch shells: the armor-piercing Mk. 8 round for anti-ship and anti-structure work, and the Mk. 13 high-explosive round designed for use against unarmored targets and shore bombardment. Interestingly, when firing the same conventional shell, the 16-inch/45 caliber Mark 6 used by the fast battleships of the North Carolina and South Dakota classes had a slight advantage over the 16-inch/50 caliber Mark 7 gun when hitting deck armor--a shell from a 45 cal gun would be slower, meaning that it would have a steeper trajectory as it descended. At 35,000 yards (20 mi; 32 km), a shell from a 45 cal would strike a ship at an angle of 45.2 degrees, as opposed to 36 degrees with the 50 cal. The Mark 7 had a greater maximum range over the Mark 6: 23.64 miles (38.04 km) vs 22.829 miles (36.740 km).

In the 1950s, the W23, an adaptation of the W19 nuclear artillery shell was developed specifically for the 16-inch guns. The shell had an estimated yield of 15 to 20 kilotons of TNT (63,000 to 84,000 GJ), and its introduction made the Iowa-class battleship's 16-inch guns the world's largest nuclear artillery, and made these four battleships the only US Navy ships ever to have nuclear shells for naval guns. Although developed for exclusive use by the battleship's guns it is not known if any of the Iowas actually carried these shells while in active service due to the United States Navy's policy of refusing to confirm or deny the presence of nuclear weaponry aboard its ships. In 1991 the United States unilaterally withdrew all of its nuclear artillery shells from service, and dismantling of the US nuclear artillery inventory is said to have been completed in 2004.

Secondary battery

The Iowas carried ten Mark 28 Mod 2 twin enclosed base ring mounts supporting 5-inch (127 mm)/38 caliber Mark 12 guns. Originally designed to be mounted upon destroyers built in the 1930s, these guns were so successful that they were added to many American ships during the Second World War, including every major ship type and many smaller warships constructed between 1934 and 1945. They were considered to be "highly reliable, robust and accurate" by the Navy's Bureau of Ordnance.

Each 5-inch/38 gun weighed almost 4,000 pounds (1,800 kg) without the breech; the entire mount weighed 156,295 pounds (70,894 kg). It was 223.8 inches (5,680 mm) long overall, had a bore length of 190 inches (4,800 mm) and a rifling length of 157.2 inches (3,990 mm). The gun could fire shells at about 2,500-2,600 ft/s (760-790 m/s); about 4,600 could be fired before the barrel needed to be replaced. Minimum and maximum elevations were -15 and 85 degrees respectively. The guns' elevation could be raised or lowered at about 15 degrees per second. The mounts closest to the bow and stern could aim from -150 to 150 degrees; the others were restricted to -80 to 80 degrees. They could be turned at about 25 degrees per second.

The 5-inch/38 gun functioned as a dual purpose gun (DP); that is, it was able to fire at both surface and air targets with a reasonable degree of success. However, this did not mean that it possessed inferior anti-air abilities. As proven during 1941 gunnery tests conducted aboard North Carolina the gun could consistently shoot down aircraft flying at 12,000-13,000 feet (2.3-2.5 mi; 3.7-4.0 km), twice the effective range of the earlier single purpose 5-inch/25 caliber AA gun. As Japanese airplanes became faster, the gun lost some of its effectiveness in the anti-aircraft role; however, toward the end of the war its usefulness as an anti-aircraft weapon increased again because of an upgrade to the Mark 37 Fire Control System and proximity-fused shells.

The 5-inch/38 gun would remain on the battleships for the ships' entire service life; however, the total number of guns and gun mounts was reduced from 20 guns in ten mounts to 12 guns in six mounts during the 1980s' modernization of the four Iowas. The removal of four of the gun mounts was required for the battleships to be outfitted with the armored box launchers needed to carry and fire Tomahawk missiles. At the time of the 1991 Persian Gulf War, these guns had been largely relegated to littoral defense for the battleships. Since each battleship carried a small detachment of Marines aboard, the Marines would man one of the 5-inch gun mounts.

Anti-air battery

At the time of their commissioning, all four of the Iowa-class battleships were equipped with 20 quad 40 mm mounts and 49 single 20 mm mounts. These guns were respectively augmented with the Mk 14 range sight and Mk 51 fire control system to improve accuracy.

The Oerlikon 20 mm anti-aircraft gun, one of the most heavily produced anti-aircraft guns of the Second World War, entered service in 1941, and replaced the 0.50 inches (12.7 mm)/90 M2 Browning MG on a one-for-one basis. Between December 1941 and September 1944, 32% of all Japanese aircraft downed were credited to this weapon, with the high point being 48.3% for the second half of 1942; however, the 20 mm guns were found to be ineffective against the Japanese Kamikaze attacks used during the latter half of World War II and were subsequently phased out in favor of the heavier Bofors 40 mm anti-aircraft gun.

When the Iowa-class battleships were commissioned in 1943 and 1944, they carried twenty quad 40 mm AA gun mounts, which they used for defense against enemy aircraft. These heavy guns were also employed in the protection of allied aircraft carriers operating in the Pacific Theater of World War II, and accounted for roughly half of all Japanese aircraft shot down between 1 October 1944 and 1 February 1945. Although successful in this role, the guns were stripped from the battleships--initially from New Jersey when reactivated in 1968 and later from Iowa, Missouri, and Wisconsin when they were reactivated for service in the 1980s.

Propulsion and size

When the Second Vinson Act was passed by the United States Congress in 1938, the US Navy moved quickly to develop a 45,000-ton battleship that would pass through the 110 ft (34 m) wide Panama Canal. Drawing on a 1935 empirical formula for predicting a ship's maximum speed based on scale-model studies in flumes of various hull forms and propellers and a newly developed empirical theorem that related waterline length to maximum beam, the Navy drafted plans for a battleship class with a maximum beam of 108 ft (33 m) which, when multiplied by 7.96, produced a waterline length of 860 ft (260 m)--permitting a maximum speed of 34.9 kn (64.6 km/h; 40.2 mph). The Navy also called for the class to have a lengthened forecastle and amidship, which would increase speed, and a bulbous bow.

The double-expansion engines consist of a high-pressure (HP) turbine and a low-pressure (LP) turbine. The steam is first passed through the HP turbine which turns at up to 2,100 rpm. The steam, largely depleted at this point, is then passed through a large conduit to the LP turbine. By the time it reaches the LP turbine, it has no more than 50 psi (300 kPa) of pressure left. The LP turbine increases efficiency and power by extracting the last little bit of energy from the steam. After leaving the LP turbine, the exhaust steam passes into a condenser and is then returned as feed water to the boilers. Water lost in the process is replaced by three evaporators, which can make a total of 60,000 US gallons per day (3 liters per second) of fresh water. After the boilers have had their fill, the remaining fresh water is fed to the ship's potable water systems for drinking, showers, hand washing, cooking, etc. All of the urinals and all but one of the toilets on the Iowa-class flush with saltwater in order to conserve fresh water. The turbines, especially the HP turbine, can turn at 2,000 rpm; their shafts drive through reduction gearing that turns the propeller shafts at speeds up to 225 rpm, depending upon the desired speed of the ship. The Iowas were to be outfitted with four screws: the outer pair consisting of two four-bladed propellers roughly 18 ft (5.5 m) in diameter and the inboard screws that have five blades and are roughly 17.5 ft (5.3 m) in diameter. The propeller designs were adopted after earlier testing had determined that propeller cavitation caused a drop in efficiency at speeds over 30 kn (56 km/h; 35 mph). The two inner shafts were housed in skegs to smooth the flow of water to the propellers and improve the structural strength of the stern. The engineering plant on Iowa and Missouri consisted of four General Electric cross-compound steam turbine engines, each driving a single shaft. The equivalent machinery on New Jersey and Wisconsin was provided by Westinghouse.

Four fire rooms contained eight Babcock & Wilcox M-Type boilers operating at 600 pounds per square inch (4,137 kPa; 42 kgf/cm2) with a maximum superheater outlet temperature of 850 °F (454 °C). Each engineroom has a pair of 1.25 MW Ship's Service Turbine Generators (SSTGs), providing the ship with a total of 10 MW of electrical power. Additionally, the vessels have a pair of 250 kW emergency diesel generators. To allow battle-damaged electrical circuits to be repaired or bypassed, the lower decks of the ship have a Casualty Power System whose large 3-wire cables and wall outlets called "biscuits" can be used to reroute power.

Electronics

The earliest search radars installed were the SK air-search radar and SG surface-search radar during World War II. They were located on the mainmast and forward fire-control tower of the battleships, respectively. As the war drew to a close, the United States introduced the SK-2 air-search radar and SG surface-search radar; the Iowa-class was updated to make use of these systems between 1945 and 1952. At the same time, the ships' radar systems were augmented with the installation of the SP height finder on the main mast. In 1952, AN/SPS-10 surface-search radar and AN/SPS-6 air-search radar replaced the SK and SG radar systems, respectively. Two years later the SP height finder was replaced by the AN/SPS-8 height finder, which was installed on the main mast of the battleships.

In addition to these search and navigational radars, the Iowa-class were also outfitted with a variety of fire control systems for their gun systems, and later for their missile systems. Beginning with their commissioning, the battleships made use of a trio of Mk 38 gun fire control systems to direct the 16-inch guns and a quartet of Mk 37 gun fire control systems to direct the 5-inch gun batteries. These systems were upgraded over time, but remained the cornerstones of the combat radar systems on the Iowa-class during their careers. The range estimation of these gunfire control systems provided a significant accuracy advantage over earlier ships with optical rangefinders; this was demonstrated off Truk Atoll on 16 February 1944, when Iowa engaged the Japanese destroyer Nowaki at a range of 35,700 yards (32.6 km; 17.6 nmi) and straddled her, setting the record for the longest-ranged straddle in history.

Armor

Like all battleships, the Iowas carried heavy armor protection against shellfire and bombs with significant underwater protection against torpedoes. The Iowas' "all-or-nothing" armor scheme was modeled on that of the preceding South Dakota-class, and designed to give a zone of immunity against fire from 16-inch/45-caliber guns between 18,000 and 30,000 yards (16,000 and 27,000 m; 10 and 17 mi) away. The protection system includes Class A face-hardened Krupp cemented (K.C.) armor and Class B homogeneous Krupp-type armor; furthermore, Special Treatment Steel (STS), a high-tensile structural steel with armor properties comparable to Class B, was extensively used in the hull plating to increase protection. The citadel consisting of the magazines and engine rooms were protected by an STS outer hull plating 1.5 inches (38 mm) thick and a Class A armor belt 12.1 inches (307 mm) thick mounted on 0.875 inches (22.2 mm) STS backing plate; the armor belt is sloped at 19 degrees, equivalent to 17.3 in (439 mm) at 19,000 yards. The armor belt extends to the triple bottom, where the Class B lower portion tapers to 1.62 inches (41 mm). The ends of the armored citadel are closed by 11.3 inches (287 mm) vertical Class A traverse bulkheads for the first two ships of the class. Missouri and Wisconsin incorporated the most significant change in armor from the South Dakotas: the increase to 14.5 inches (368 mm) of the armor on the forward transverse armored bulkhead. The extra armor provided protection from fire directly ahead, which was considered more likely given the high speed of the Iowas.

The Iowas had heavily protected main battery turrets, with the turret face armor of 19.5 inches (495 mm) combination of Class B and STS and turret sides of 9.5 inches (241 mm) Class A and turret rear of 12 inches (305 mm) Class A. The conning tower and the turret barbettes armor is up to 17.3 inches (439 mm) thick Class A and Class B respectively. The propulsion shafts and steering gear had considerable protection, with a 13.5 inches (340 mm) Class A side strake behind the citadel.

The deck armor consists of a 1.5 in (38 mm) thick STS weather deck, a combined 6 in (152 mm) thick Class B and STS main armored deck, and a 0.63 inches (16 mm) thick STS splinter deck. Over the magazines, the splinter deck is replaced by a 1 inch (25 mm) STS third deck that separates the magazine from the main armored deck. The powder magazine rooms are separated from the turret platforms by a pair of 1.5-inch STS annular bulkheads under the barbettes for flashback protection. The installation of armor on the Iowas also differed from those of earlier battleships in that the armor was installed while the ships were still "on the way" rather than after the ships had been launched.

The armor's immunity zone shrank considerably against guns equivalent to their own 16-inch/50-caliber guns armed with the Mark 8 "Super-heavy" APC (Armor Piercing, Capped) shell due to the weapon's increased muzzle velocity and improved shell penetration; increasing the armor would have increased weight and reduced speed, a compromise that the General Board was not willing to make.

The Iowa's torpedo defense was virtually the same as the South Dakota's, consisting of four longitudinal torpedo bulkheads behind the outer hull plating with a system depth of 17.9 feet (5.46 m) to absorb the energy of a torpedo warhead. The extension of the armor belt to the triple bottom, where it tapers to a thickness of 1.62 inches (41 mm), serves as one of the torpedo bulkheads and was hoped to add to protection. Additionally, several compartments were liquid loaded in order for the torpedo bulkheads to elastically deform and absorb energy. The outer hull was intended to detonate a torpedo, with the outer two compartments absorbing the shock and with any splinters or debris being stopped by the armored belt and the empty compartment behind it. However, the Navy discovered in caisson tests in 1939 that this torpedo defense system was actually less effective than the previous design used on the North Carolina-class due to the rigidity of the lower armor belt causing leakage into adjacent compartments. To mitigate the effects, the liquid loading system was altered so that the two outermost compartments were filled, while the two inboard compartments were void spaces. The last two ships of the class laid down, Illinois and Kentucky, slightly modified the torpedo defense system, with knuckles along certain bulkheads eliminated; this was estimated to improve the strength of the system by as much as 20%. Based on costly lessons in the Pacific theater, concerns were raised about the ability of the armor on these battleships to withstand aerial bombing, particularly high altitude bombing using armor piercing bombs. Developments such as the Norden bombsight further fueled these concerns. When these concerns surfaced nothing could be done to adequately address the problem. Furthermore, experience in the Pacific theater demonstrated that high altitude unguided bombing was not particularly effective against maneuvering warships.

Aircraft (1943-69)

When they were commissioned during World War II, the Iowa-class battleships came equipped with two aircraft catapults designed to launch floatplanes. Initially, the Iowas carried the Vought OS2U Kingfisher and Curtiss SC Seahawk, both of which were employed to spot for the battleship's main gun batteries--and, in a secondary capacity, perform search-and-rescue missions.

By the time of the Korean War, helicopters had replaced floatplanes and the Sikorsky HO3S-1 helicopter was employed. New Jersey made use of the Gyrodyne QH-50 DASH drone for her Vietnam war deployment in 1968-1969.


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Conversion proposals

The Iowa class were the only battleships with the speed required for post-war operations based around fast aircraft carrier task forces. There were a number of proposals in the early Cold War to convert the class to take into account changes in technology and doctrine. These included plans to equip the class with nuclear missiles, add aircraft capability and--in the case of Illinois and Kentucky--a proposal to rebuild both as aircraft carriers instead of battleships.

Initially, the Iowa-class was to consist of only four battleships: Iowa, New Jersey, Missouri, and Wisconsin. However, changing priorities during World War II resulted in the battleships Montana and Ohio being reordered as Illinois and Kentucky respectively. At the time these two battleships were to be built a proposal was put forth to have them constructed as aircraft carriers rather than fast battleships. The plan called for the ships to be rebuilt to include a flight deck and an armament suite similar to that placed aboard the Essex-class aircraft carriers that were at the time under construction in the United States. Ultimately, nothing came of the design proposal to rebuild these two ships as aircraft carriers and they were cleared for construction as fast battleships to conform to the Iowa-class design, though they differed from the earlier four that were built. Eventually, the Cleveland-class light cruisers were selected for the aircraft-carrier conversion. Nine of these light cruisers would be rebuilt as Independence-class light aircraft carriers.

After the surrender of the Empire of Japan, construction on Illinois and Kentucky stopped. Illinois was eventually scrapped, but Kentucky's construction had advanced enough that several plans were proposed to complete Kentucky as a guided missile battleship (BBG) by removing the aft turret and installing a missile system. A similar conversion had already been performed on the battleship Mississippi (BB-41/AG-128) to test the RIM-2 Terrier missile after World War II. One such proposal came from Rear Admiral W. K. Mendenhall, Chairman of the Ship[s] Characteristics Board (SCB); Mendehall proposed a plan that called for $15-30 million to be spent to allow Kentucky to be completed as a guided-missile battleship (BBG) carrying eight SSM-N-8 Regulus II guided missiles with a range of 1,000 nautical miles (1,900 km; 1,200 mi). He also suggested Terrier or RIM-8 Talos launchers to supplement the AA guns and proposed nuclear (instead of conventional) shells for the 16-inch guns. This never materialized, and Kentucky was ultimately sold for scrap in 1958, although her bow was used to repair her sister Wisconsin after a collision on 6 May 1956, earning her the nickname WisKy.

In 1954, the Long Range Objectives Group of the United States Navy suggested converting the Iowa-class ships to BBGs. In 1958, the Bureau of Ships offered a proposal based on this idea. This replaced the 5- and 16-inch gun batteries with "two Talos twin missile systems, two RIM-24 Tartar twin missile systems, an RUR-5 ASROC antisubmarine missile launcher, and a Regulus II installation with four missiles", as well as flagship facilities, sonar, helicopters, and fire-control systems for the Talos and Tartar missiles. In addition to these upgrades, 8,600 long tons (8,700 t) of additional fuel oil was also suggested to serve in part as ballast for the battleships and for use in refueling destroyers and cruisers. Due to the estimated cost of the overhaul ($178-193 million) this proposal was rejected as too expensive; instead, the SCB suggested a design with one Talos, one Tartar, one ASROC and two Regulus launchers and changes to the superstructure, at a cost of up to $85 million. This design was later revised to accommodate the Polaris Fleet Ballistic Missile, which in turn resulted in a study of two schemes by the SCB. In the end, none of these proposed conversions for the battleships were ever authorized. Interest in converting the Iowas into guided-missile battleships began to deteriorate in 1960, because the hulls were considered too old and the conversion costs too high. Nonetheless, additional conversion proposals--including one to install the AN/SPY-1 Aegis Combat System radar on the battleships--were suggested in 1962, 1974 and 1977, but as before, these proposals failed to gain the needed authorization. This was due, in part, to the possibility that sensitive electronics within 200 ft (61 m) of any 16-inch gun muzzle may be damaged from overpressure.


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1980s refit

In 1980, Ronald Reagan was elected President, with a plan to rebuild the US military as a counter to the increasing military power of the Soviet Union as one of his benchmark commitments. At the time, the Soviet Navy was in the process of commissioning a class of missile cruiser the like of which had not been seen for decades--the Kirov-class was the largest type of surface warship (other than aircraft carriers or amphibious assault vessels) built since World War II, and the US had not envisioned building anything like it. As a consequence, as part of Reagan's 600-ship Navy policy and to act as a counter to the Kirov-class, the US Navy began the process of reactivating the four Iowa-class units and modernizing them for service in the 1980s.

During this reactivation, the Navy considered several concepts entailing removal of the aft 16-inch turret. Martin Marietta proposed to replace the turret with servicing facilities for 12 AV-8B Harrier STOVL jumpjets. Charles Myers, former Navy test pilot then a consultant for The Pentagon, proposed replacement of the turret with vertical launch systems for missiles and a flight deck for Marine helicopters. Naval Institute Proceedings proposed a canted flight deck (complete with a steam catapult) and arrestor wires to operate F/A-18 Hornet fighters. Plans for these conversions were dropped in 1984, but each battleship was overhauled to burn navy distillate fuel and modernized to carry electronic warfare suites, close-in weapon systems (CIWS) for self-defense, and missiles. It was determined that the total cost of reactivating and modernising one battleship was roughly the same as the cost of building a new Oliver Hazard Perry-class frigate.

After recommissioning, the modernized battleships operated as centerpieces of their own battle group (termed as a Battleship Battle Group or Surface Action Group), consisting of one Ticonderoga-class cruiser, one Kidd-class destroyer or Arleigh Burke-class destroyer, one Spruance-class destroyer, three Oliver Hazard Perry-class frigates and one support ship, such as a fleet oiler.

Armament

During their modernization in the 1980s each Iowa was equipped with four of the US Navy's Phalanx CIWS mounts, two of which sat just behind the bridge and two which were next to the after ship's funnel. Iowa, New Jersey, and Missouri were equipped with the Block 0 version of the Phalanx, while Wisconsin received the first operational Block 1 version in 1988. The Phalanx system is intended to serve as a last line of defense against enemy missiles and aircraft, and when activated can engage a target with a 20 mm caliber M61 Vulcan 6-barreled Gatling cannon at a distance of approximately 4,000 yards (3.7 km; 2.0 nmi).

As part of their modernization in the 1980s, each of the Iowas received a complement of Armored Box Launchers and "shock hardened" Mk. 141 quad cell launchers. The former was used by the battleships to carry and fire the BGM-109 Tomahawk Land Attack Missiles (TLAMs) for use against enemy targets on land, while the latter system enabled the ships to carry a complement of RGM-84 Harpoon anti-ship missiles for use against enemy ships. With an estimated range of 675 to 1,500 nautical miles (1,250 to 2,778 km; 777 to 1,726 mi) for the Tomahawk missile and 64.5 to 85.5 nautical miles (119.5 to 158.3 km; 74.2 to 98.4 mi) for the Harpoon missile system, these two missile systems displaced the 16-inch guns and their maximum range of 42,345 yards (38.7 km; 20.9 nmi) to become the longest-ranged weapons on the battleships during the 1980s. It has been alleged by members of the environmental group Greenpeace that the battleships carried the TLAM-A (also cited, incorrectly, as the TLAM-N)--a Tomahawk missile with a variable yield W80 nuclear warhead--during their 1980s service with the United States Navy, but owing to the United States Navy's policy of refusing to confirm or deny the presence of nuclear weaponry aboard its ships, these claims can not be conclusively proved. Between 2010 and 2013, the U.S. withdrew the BGM-109A, leaving only conventional munitions packages for its Tomahawk Missile inventory.

Owing to the original 1938 design of the battleships, the Tomahawk missiles could not be fitted to the Iowa-class unless the battleships were rebuilt in such a way as to accommodate the missile mounts that would be needed to store and launch the Tomahawks. This realization prompted the removal of the anti-aircraft guns previously installed on the Iowas and the removal of four of each of the battleships' ten 5-inch/38 DP mounts. The mid and aft end of the battleships were then rebuilt to accommodate the missile magazines. At one point, the NATO Sea Sparrow was to be installed on the reactivated battleships; however, it was determined that the system could not withstand the overpressure effects from firing the main battery. To supplement the anti-aircraft capabilities of the Iowas, five FIM-92 Stinger surface-to-air missile firing positions were installed. These secured the shoulder-launched weapons and their rounds for ready use by the crew.

Electronics

During their modernization under the 600-ship Navy program, the Iowa-class battleships' radar systems were again upgraded. The AN/SPS-6 air-search radar system was replaced with the AN/SPS-49 radar set (which also augmented the existing navigation capabilities on the battleships), and the AN/SPS-8 surface-search radar set was replaced by the AN/SPS-67 search radar.

By the Korean War, jet engines had replaced propellers on aircraft, which severely limited the ability of the 20 mm and 40 mm AA batteries and their gun systems to track and shoot down enemy planes. Consequently, the AA guns and their associated fire-control systems were removed when reactivated. New Jersey received this treatment in 1967, and the others followed in their 1980s modernizations. In the 1980s, each ship also received a quartet of Phalanx Close in Weapon System (CIWS) mounts which made use of a radar system to locate incoming enemy projectiles and destroy them with a 20 mm Gatling gun before they could strike the ship.

With the added missile capacity of the battleships in the 1980s came additional fire-support systems to launch and guide the ordnance. To fire the Harpoon anti-ship missiles, the battleships were equipped with the SWG-1 fire-control system, and to fire the Tomahawk missiles the battleships used either the SWG-2 or SWG-3 fire-control system. In addition to these offensive-weapon systems, the battleships were outfitted with the AN/SLQ-25 Nixie to be used as a lure against enemy torpedoes, an SLQ-32 electronic warfare system that can detect, jam, and deceive an opponent's radar and a Mark 36 SRBOC system to fire chaff rockets intended to confuse enemy missiles.

Aside from the electronics added for weaponry control, all four battleships were outfitted with a communications suite used by both cruisers and guided missile cruisers in service at the time. This communication suite included the OE-82 antenna for satellite communications, but did not include the Naval Tactical Data System.

Aircraft (1982-1992)

During the 1980s these battleships made use of the RQ-2 Pioneer, an unmanned aerial vehicle employed in spotting for the guns. Launched from the fantail using a rocket-assist booster that was discarded shortly after takeoff, the Pioneer carried a video camera in a pod under the belly of the aircraft which transmitted live video to the ship so operators could observe enemy actions or fall of shot during naval gunnery. To land the UAV a large net was deployed at the back of the ship; the aircraft was flown into it. Missouri and Wisconsin both used the Pioneer UAVs successfully during Operation Desert Storm, and in one particularly memorable incident, a Pioneer UAV operated by Wisconsin received the surrender of Iraqi troops during combat operations. This particular Pioneer was later donated to the Smithsonian Institution, and is now on public display. During Operation Desert Storm these Pioneers were operated by detachments of VC-6. In addition to the Pioneer UAVs, the recommissioned Iowas could support six types of helicopters: the Sikorsky HO3S-1, UH-1 Iroquois, SH-2 Seasprites, CH-46 Sea Knight, CH-53 Sea Stallion and the LAMPS III SH-60B Seahawk.


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Gunfire support role

Following the 1991 Gulf War and the subsequent dissolution of the Soviet Union, the United States Navy began to decommission and mothball many of the ships it had brought out of its reserve fleet in the drive to attain a 600-ship Navy. At the height of Navy Secretary John F. Lehman's 600-ship Navy plan, nearly 600 ships of all types were active within the Navy. This included fifteen aircraft carriers, four battleships and over 100 submarines, along with various other types of ships the overall plan specified. When the Soviet Union collapsed in 1991 the Navy sought to return to its traditional, 313-ship composition. While reducing the fleet created under the 600-ship Navy program, the decision was made to deactivate the four recommissioned Iowa-class battleships and return them to the reserve fleet.

In 1995, the decommissioned battleships were removed from the Naval Vessel Register (NVR) after it was determined by ranking US Navy officials that there was no place for a battleship in the modern navy. In response to the striking of the battleships from the Naval Vessel Register a movement began to reinstate the battleships, on the grounds that these vessels had superior firepower over the then-existing 5-inch guns found on the Spruance, Kidd, and Arleigh Burke-class destroyers, and Ticonderoga-class cruisers. Citing concern over the lack of available gunfire to support amphibious operations, Congress demanded that the United States Navy reinstate two battleships to the naval vessel register and maintain them with the mothball fleet, until the Navy could certify it had gunfire support within the current fleet that would meet or exceed the battleship's capability.

The debate over battleships in the modern navy continued until 2006, when the two reinstated battleships were stricken after naval officials submitted a two-part plan that called for the near-term goal of increasing the range of the guns currently in use on the Flight I Arleigh Burke-class destroyers with specially designed ammunition intended to allow a 5-inch projectile fired from these guns to travel an estimated 40 nautical miles (74 km; 46 mi) inland. The long-term goal calls for the replacement of the two battleships with vessels of the Zumwalt-class of guided-missile destroyers. These ships are to be outfitted with an advanced gun system (AGS) that will fire specially developed 6-inch Long Range Land Attack Projectiles for shore bombardment; however, the long-term goal for the Zumwalt-class is to have the ships mount railguns or free-electron lasers.


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Cultural significance

The Iowa-class has become culturally symbolic in the United States in many different ways, to the point where certain elements of the American public--such as the United States Naval Fire Support Association--are unwilling to part with the battleships despite their apparent obsolescence in the face of modern naval combat doctrine that places great emphasis on air supremacy and missile firepower. Although all have been officially stricken from the Naval Vessel Register they have been spared scrapping and were donated for use as museum ships.

Their service records have added to their fame, ranging from their work as carrier escorts in World War II to their shore bombardment duties in North Korea, North Vietnam, and the Middle East, as well as their service in the Cold War against the expanded Soviet Navy. Their reputation combined with the stories told concerning the firepower of these battleships' 16-inch guns are such that when they were brought out of retirement in the 1980s in response to increased Soviet Naval activity--and in particular, in response to the commissioning of the Kirov-class battlecruisers--the United States Navy was inundated with requests from former sailors pleading for a recall to active duty so they could serve aboard one of the battleships.

In part because of the service length and record of the class, members have made numerous appearances in television shows, video games, movies, and other media, including appearances of the Kentucky and Illinois in the anime series Neon Genesis Evangelion, the History Channel documentary series Battle 360: USS Enterprise, the Discovery Channel documentary The Top 10 Fighting Ships (where the Iowa-class was rated Number 1), the stealth action game Metal Gear Solid 4: Guns of the Patriots, the Real Time Tactics game World in Conflict, the book turned movie A Glimpse of Hell, the 1989 music video for the song by Cher If I Could Turn Back Time, the 1992 film Under Siege, and the 2012 film Battleship, among other appearances. Japanese rock band Vamps performed the finale of their 2009 US tour on board Missouri on 19 September 2009.


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Ships

When brought into service during the final years of World War II, the Iowa-class battleships were assigned to operate in the Pacific Theatre of World War II. By this point in the war, aircraft carriers had displaced battleships as the primary striking arm of both the United States Navy and the Imperial Japanese Navy. As a result of this shift in tactics, U.S. fast battleships of all classes were relegated to the secondary role of carrier escorts and assigned to the Fast Carrier Task Force to provide anti-aircraft screening for U.S. aircraft carriers and perform shore bombardment. Three were recalled to service in the 1950s with the outbreak of the Korean War, and provided naval artillery support for U.N. forces for the entire duration of the war before being returned to mothballs in 1955 after hostilities ceased. In 1968, to help alleviate U.S. air losses over North Vietnam, New Jersey was summoned to Vietnam, but was decommissioned a year after arriving. All four returned in the 1980s during the drive for a 600-ship Navy to counter the new Soviet Kirov-class battlecruisers, only to be retired after the collapse of the Soviet Union on the grounds that they were too expensive to maintain.

1. ^ Kentucky was not officially launched; her hull was moved from drydock to allow Missouri to be admitted for repairs following her grounding.

Iowa

Iowa was ordered 1 July 1939, laid down 27 June 1940, launched 27 August 1942, and commissioned 22 February 1943. She conducted a shakedown cruise in Chesapeake Bay before sailing to Naval Station Argentia, Newfoundland, to be ready in case the German battleship Tirpitz entered the Atlantic. Transferred to the Pacific Fleet in 1944, Iowa made her combat debut in February and participated in the campaign for the Marshall Islands. The ship later escorted U.S. aircraft carriers conducting air raids in the Marianas campaign, and then was present at the Battle of Leyte Gulf. During the Korean War, Iowa bombarded enemy targets at Songjin, H?ngnam, and Kojo, North Korea. Iowa returned to the US for operational and training exercises before being decommissioned on 24 February 1958. Reactivated in the early 1980s, Iowa operated in the Atlantic Fleet, cruising in North American and European waters for most of the decade and participating in joint military exercises with European ships. On 19 April 1989, 47 sailors were killed following an explosion in her No. 2 turret. In 1990, Iowa was decommissioned for the last time and placed in the mothball fleet. She was stricken from the Naval Vessel Register on 17 March 2006. Iowa was anchored as part of the National Defense Reserve Fleet in Suisun Bay, California until October 2011, when she was towed from her mooring to Richmond, California for renovation as a museum ship. She was towed from Richmond in the San Francisco Bay on 26 May 2012, to San Pedro at the Los Angeles Waterfront to serve as a museum ship run by Pacific Battleship Center and opened to the public on 7 July 2012.

New Jersey

New Jersey was ordered 4 July 1939, laid down 16 September 1940, launched 7 December 1942, and commissioned 23 May 1943. New Jersey completed fitting out and trained her initial crew in the Western Atlantic and Caribbean before transferring to the Pacific Theatre in advance of the planned assault on the Marshall Islands, where she screened the U.S. fleet of aircraft carriers from enemy air raids. At the Battle of Leyte Gulf, the ship protected carriers with her anti-aircraft guns. New Jersey then bombarded Iwo Jima and Okinawa. During the Korean War, the ship pounded targets at Wonsan, Yangyang, and Kansong. Following the Armistice, New Jersey conducted training and operation cruises until she was decommissioned. Recalled to duty in 1968, New Jersey reported to the gunline off the Vietnamese coast, and shelled North Vietnamese targets before departing the line in December 1968. She was decommissioned the following year. Reactivated in 1982 under the 600-ship Navy program, New Jersey was sent to Lebanon to protect U.S. interests and U.S. Marines, firing her main guns at Druze and Syrian positions in the Beqaa Valley east of Beirut. Decommissioned for the last time 8 February 1991, New Jersey was briefly retained on the Naval Vessel Register before being donated to the Home Port Alliance of Camden, New Jersey for use as a museum ship in October 2001.

Missouri

Missouri was the last of the four Iowas to be completed. She was ordered 12 June 1940, laid down 6 January 1941, launched 29 January 1944, and commissioned 11 June 1944. Missouri conducted her trials off New York with shakedown and battle practice in Chesapeake Bay before transferring to the Pacific Fleet, where she screened US aircraft carriers involved in offensive operations against the Japanese before reporting to Okinawa to shell the island in advance of the planned landings. Following the bombardment of Okinawa, Missouri turned her attention to the Japanese homeland islands of Honshu and Hokkaido, performing shore bombardment and screening US carriers involved in combat operations. She became a symbol of the US Navy's victory in the Pacific when representatives of the Empire of Japan boarded the battleship to sign the documents of unconditional surrender to the Allied powers in September 1945. After World War II, Missouri conducted largely uneventful training and operational cruises until suffering a grounding accident. In 1950, she was dispatched to Korea in response to the outbreak of the Korean War. Missouri served two tours of duty in Korea providing shore bombardment. She was decommissioned in 1956. She spent many years at Puget Sound Naval Shipyard in Bremerton, Washington. Reactivated in 1984, as part of the 600-ship Navy plan, Missouri was sent on operational cruises until being assigned to Operation Earnest Will in 1988. In 1991, Missouri participated in Operation Desert Storm, firing 28 Tomahawk Missiles and 759 16-inch shells at Iraqi targets along the coast. Decommissioned for the last time in 1992, Missouri was donated to the USS Missouri Memorial Association of Pearl Harbor, Hawaii, for use as a museum ship in 1999.

Wisconsin

Wisconsin was ordered 12 June 1940, laid down 25 January 1942, launched 7 December 1943, and commissioned 16 April 1944. After trials and initial training in Chesapeake Bay, she transferred to the Pacific Fleet in 1944, and was assigned to protect the US fleet of aircraft carriers involved in operations in the Philippines until summoned to Iwo Jima to bombard the island in advance of the Marine landings. Afterward, she proceeded to Okinawa, bombarding the island in advance of the allied amphibious assault. In mid-1945 Wisconsin turned her attention to bombarding the Japanese home islands until the surrender of Japan in August. Reactivated in 1950, for the Korean War, Wisconsin served two tours of duty, assisting South Korean and UN forces by providing call fire support and shelling targets. In 1956, the bow of the uncompleted Kentucky was removed and grafted on Wisconsin, which had collided with the destroyer USS Eaton. Decommissioned in 1958, Wisconsin was placed in the reserve fleet at the Philadelphia Naval Shipyard until reactivated in 1986, as part of the 600-ship Navy plan. In 1991, Wisconsin participated in Operation Desert Storm, firing 24 Tomahawk Missiles at Iraqi targets, and expending 319 16-inch shells at Iraqi troop formations along the coast. Decommissioned for the last time 30 September 1991, Wisconsin was placed in the reserve fleet until stricken from the Naval Vessel Register on 17 March 2006, so she could be transferred for use as a museum ship. Wisconsin is currently berthed at the Nauticus maritime museum in Norfolk, Virginia.

Illinois and Kentucky

Hull numbers BB-65 and BB-66 were originally intended as the first and second ships of the Montana-class of battleships; however the passage of an emergency war building program on 19 July 1940, resulted in both hulls being reordered as Iowa-class units to save time on construction. The war ended before either could be completed, and work was eventually stopped. Initially, proposals were made to convert the hulls into aircraft carriers similar to the Essex-class, but the effort was dropped. Eventually both hulls were scrapped.

Illinois was ordered on 9 September 1940, and initially laid down on 6 December 1942. However, work was suspended pending a decision on whether to convert the hull to an aircraft carrier. Upon determination the result would cost more and be less capable than building from scratch construction resumed, but was canceled for good approximately one-quarter complete on 11 August 1945. She was sold for scrap and broken up on the slipway in September 1958.

Kentucky was ordered on 9 September 1940, and laid down on 7 March 1942. Work on the ship was suspended in June 1942, and the hull floated out to make room for the construction of LSTs. The interruption lasted for two and a half years while a parallel aircraft carrier debate played out as with Illinois, reaching the same conclusion. Work resumed in December 1944, with completion projected for mid-1946. Further suggestions were made to convert Kentucky into a specialist anti-aircraft ship, and work was again suspended. With the hull approximately three-quarters completed she was floated on 20 January 1950, to clear a dry-dock for repairs to Missouri, which had run aground. During this period, plans were proposed to convert Kentucky into a guided missile battleship, which saw her reclassified from BB-66 to BBG-1. When these failed construction of any sort, work never resumed and the ship was used as a parts hulk; in 1956, her bow was removed and shipped in one piece across Hampton Roads and grafted onto Wisconsin, which had collided with the destroyer Eaton. In 1958, the engines installed on Kentucky were salvaged and installed on the Sacramento-class fast combat support ships Sacramento and Camden. Ultimately, what remained of the hulk was sold for scrap on 31 October 1958.

Source of the article : Wikipedia



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