USS New Mexico (BB-40)

USS New Mexico (BB-40)
Ship name	USS New Mexico (BB-40)
Caption	USS New Mexico underway in the 1920s
Ship class	New Mexico-class battleship
Displacement	32,000 long tons (standard)
Length	624 ft
Beam	97 ft
Draft	30 ft
Propulsion	Parsons steam turbines, 12 Babcock & Wilcox boilers
Speed	21 knots
Complement	~1,100 officers and enlisted
Armament	see section
Armor	see section
Built by	New York Shipbuilding Corporation
Laid down	27 May 1915
Launched	20 May 1917
Commissioned	20 Dec 1918
Fate	Target ship, sunk 1948

USS New Mexico (BB-40) was the lead ship of the New Mexico-class battleships built for the United States Navy during the 1910s. Commissioned in December 1918, she served through the interwar period with cruises to the Caribbean Sea, the Mediterranean Sea, the Pacific Ocean, and as a unit of the Battle Fleet and later Scouting Force. Modernized in the 1920s and extensively rebuilt in the 1930s, New Mexico served as convoy escort, shore bombardment platform, and flagship during World War II, before being expended as a target and sunk after the war.

Design and construction

New Mexico was laid down by the New York Shipbuilding Corporation at Camden, New Jersey under designs approved by the Bureau of Construction and Repair and Bureau of Engineering. The class reflected incremental evolution from the preceding Pennsylvania-class battleships, incorporating heavier armor, an improved secondary battery, and propulsion developments derived from trials involving USS Nevada (BB-36) and USS Pennsylvania (BB-38). Naval architects responded to lessons from Battle of Jutland-era design debates and to directives issued by the General Board of the United States Navy. Keel-laying occurred on 27 May 1915, with launching on 20 May 1917 and commissioning on 20 December 1918 under a crew drawn from Great War-era mobilization lists.

Interwar service

During the 1920s New Mexico operated with the Atlantic Fleet and Pacific Fleet, making training cruises to the Caribbean Sea, the Hawaiian Islands, and visits to Panama Canal Zone ports. She participated in fleet problems directed by the Fleet Problems (United States Navy) series, including maneuvers overseen by the Commander in Chief, United States Fleet. Routine operations included gunnery training with the Bureau of Ordnance and tactical exercises in company with dreadnoughts such as USS California (BB-44) and USS West Virginia (BB-48). Diplomatic port calls connected New Mexico to visits in Valparaiso and Pearl Harbor while naval policy debates in Washington, D.C. and the Washington Naval Treaty discussions influenced tonnage limits and modernization priorities. In the late 1920s and early 1930s she underwent incremental refits at Philadelphia Naval Shipyard and Puget Sound Navy Yard.

World War II service

At the outbreak of hostilities following the Attack on Pearl Harbor, New Mexico was stationed with the Battle Force in the Pacific Fleet and was assigned escort and patrol duties, convoying vessels between San Francisco, Honolulu, and forward bases. She provided naval gunfire support during amphibious operations in the Solomon Islands Campaign and later in the Gilbert and Marshall Islands campaign, delivering bombardments in support of assault forces drawn from units such as the 3rd Marine Division and 2nd Marine Division. New Mexico participated in operations around Kwajalein Atoll and supported carrier task forces including elements of Task Force 58. During the Philippine campaign (1944–45) she conducted shore bombardment in support of Leyte and Iwo Jima operations, working alongside battleships like USS Massachusetts (BB-59) and USS South Dakota (BB-57). She also survived the carrier‑centric fleet actions of 1944–45 and operated in tandem with Admiral William Halsey's commands and under the logistical umbrella provided by Service Squadron 10.

Postwar decommissioning and fate

Following VJ Day, New Mexico was assigned to peacetime duties including occupation support and troop repatriation runs, operating between Tokyo Bay and Pearl Harbor. She was decommissioned at Norfolk Navy Yard in 1947 as the Navy reduced its prewar fleets under postwar demobilization directed by the Secretary of the Navy. Stricken from the Naval Vessel Register, New Mexico was employed as a target in Operation Crossroads-era exercises and subsequent ordnance trials. She was used in aerial bombing, gunnery, and torpedo experiments conducted by Naval Air Station, Fleet Air Arm observers, and Naval Ordnance Test Station personnel, and finally sunk as a target off the Virginia Capes in 1948.

Armament and armor

Originally armed with twelve 14-inch/50 caliber guns in four triple turrets, New Mexico carried a secondary battery of fourteen 5-inch/51 caliber guns and an array of anti-aircraft weapons that were augmented during later refits with 3-inch/50 caliber and 40 mm Bofors mounts. Torpedo tubes were not fitted as a primary armament but anti-ship and anti-air defenses evolved through wartime additions including 20 mm Oerlikon cannons. Her armor scheme featured a main belt thickness up to 13.5 inches, deck armor varying from 3 to 4 inches, turret faces armored to 18 inches, and conning tower protection reflecting standards set by the General Board of the United States Navy and the Washington Naval Treaty limitations.

Modifications and modernizations

Interwar and pre-war modernizations at shipyards such as Brooklyn Navy Yard and Puget Sound Navy Yard included replacement of boilers, augmentation of anti-aircraft batteries, installation of improved rangefinders and fire-control systems from the Bureau of Ordnance, and superstructure changes to improve command and control. The 1930s reconstruction lengthened the forecastle, replaced cage masts with tripod masts influenced by refits on USS Colorado (BB-45), upgraded propulsion for improved efficiency, and incorporated new radar sets from MIT Radiation Laboratory and fire-control directors derived from Ford Instrument Company designs. Wartime alterations emphasized anti-aircraft defense and electronic detection, with radar suites compatible with Combat Information Center doctrine and expanded crew accommodations to house signal and radar operators.

Category:New Mexico-class battleships Category:Ships built by New York Shipbuilding Corporation Category:United States Navy battleships of World War II