The Standard-type battleship was a series of twelve battleships across five classes ordered for the United States Navy between 1911 and 1916 and commissioned between 1916 and 1923. These were considered super-dreadnoughts, with the ships of the final two classes incorporating many lessons from the Battle of Jutland.
Each vessel was produced with a series of progressive innovations, which contributed to the pre-World War II arms race. The twelve vessels constituted the US Navy's main battle line in the interwar period, while many of the ten earlier dreadnoughts were scrapped or relegated to secondary duties. Restrictions under the 1922 Washington Naval Treaty limited total numbers and size of battleships and had required some under construction to be cancelled, so it was not until the onset of World War II that new battleships were constructed. On December 7, 1941, eight were at Pearl Harbor, one at Bremerton, Washington, and three were assigned to the Atlantic Fleet.
The Standard type, by specifying common tactical operational characteristics between classes, allowed battleships of different classes to operate together as a tactical unit (BatDiv) against enemy battleships. By contrast, other navies had fast and slow battleship classes that could not operate together unless limited to the performance of the ship with slowest speed and widest turning circle. Otherwise the battle line would be split into separate "fast" and "slow" wings. The Standard type was optimised for the battleship-centric naval strategy of the era of their design.
The next US battleship classes, beginning with the North Carolina class designed in the late 1930s and commissioned in 1941, marked a departure from the Standard type, introducing the fast battleships needed to escort the aircraft carriers that came to dominate naval strategy.
Characteristics of the Standard type included:
The Colorado-class, the first US battleships to mount 16-inch (406 mm) guns, represented the endpoint of the gradual evolution of the "Standard Type" battleships. The next planned class of Standard battleships, the never-completed South Dakotas, represented a significant increase in size and armament over the Colorados. They would have been 684 feet (208 m) long, displaced 43,200 tons, had a top speed of 23 knots (43 km/h), and carried 12 16-inch (406 mm) guns. The preceding Colorado-class battleships were 624 feet (190 m) long, displaced 32,600 tons, had a top speed of 21 knots (39 km/h), and carried a main battery of eight 16-inch (406 mm) guns.
All the Standard Type were oil-burning. Since oil was scarce in the British Isles, only Nevada and Oklahoma actively participated in World War I by escorting convoys across the Atlantic Ocean between the United States and Britain.
All the Standard Types were modernised during the 1920s and 1930s. The cage masts of all but the Tennessee and Colorado classes were replaced with tripod masts topped with fire-control directors, torpedo tubes were removed and anti-aircraft guns were upgraded. Main battery elevation in the older ships was increased to 30 degrees for greater range. Most of the Standards received anti-torpedo bulges. Each ship received one or two catapults and recovery cranes for operating floatplanes for scouting and gunnery spotting.
On December 7, 1941, Colorado was undergoing overhaul at Puget Sound Navy Yard, while the three ships of the New Mexico class were assigned to the Atlantic Fleet, and the remaining eight Standard Type battleships were at Pearl Harbor forming Battleship Row.
During the Pearl Harbor Attack, Arizona's forward magazine exploded from a bomb hit and Oklahoma capsized after multiple torpedo strikes, both with significant losses of life. West Virginia and California were also sunk, while Nevada managed to get underway and was beached shortly afterward. Tennessee and Maryland each received two bomb hits.
Arizona and Oklahoma were considered permanent losses, but the other damaged and sunk battleships were salvaged and sent to the West Coast for repairs, where they also received varying degrees of upgrades similar to the features on the new South Dakota fast battleships. Tennessee, California and West Virginia emerged as the most modernized, though their widened beam exceeded the Panama Canal restrictions which limited their operations to the Pacific. Maryland, Colorado, and Pennsylvania received twin turret mounts of 5"/38 DP guns, while Nevada also had her superstructure significantly rebuilt.
The ten surviving Standard Type battleships served throughout World War II primarily as fire support for amphibious landings. Their low speed relegated them to second line duties as they could not accompany the fleet carriers that had become the dominant combatant. Six of them participated in the last battleship versus battleship engagement in naval history, the Battle of Surigao Strait, where none of them were hit.
Arizona and Oklahoma were destroyed at Pearl Harbor on December 7th, 1941. Their sisterships Pennsylvania and Nevada were used as targets in the Operation Crossroads atomic tests in 1946. In 1946 Mississippi was converted to a test vessel for new gun and missile systems and served until 1956. Most other Standard-type battleships were decommissioned in 1946 or 1947 and placed in the reserve fleet; ultimately all were scrapped by 1959.