Des Moines-class cruiser
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| Des Moines-class cruiser | |
|---|---|
 Public domain · source | |
| Name | Des Moines-class cruiser |
| Alt | USS Des Moines underway, 1948 |
| Country | United States |
| Type | Heavy cruiser |
| Builder | Bethlehem Steel Corporation |
| Laid down | 1945 |
| Launched | 1946–1948 |
| Commissioned | 1948–1949 |
| Displacement | ~17,000–20,000 long tons |
| Length | 716 ft |
| Beam | 76 ft |
| Draft | 26 ft |
| Propulsion | Steam turbines; New York Shipbuilding Corporation style machinery arrangements |
| Speed | 33 knots |
| Complement | ~1,470 officers and enlisted |
| Armour | Belt and deck armor typical of post‑World War II United States Navy cruisers |
| Armament | Primarily 8"/55 caliber guns in auto‑loading turrets; secondary battery; dual-purpose and anti‑aircraft weapons |
| Aircraft | Seaplane facilities on early designs removed in service |
| Status | All decommissioned and scrapped by late 20th century |
Des Moines-class cruiser The Des Moines-class cruiser was the final class of US heavy cruisers completed with advanced automatic 8-inch/55 caliber guns, designed during World War II and commissioned during the early Cold War. Combining heavy armament, high speed, and improved automation, the class reflected lessons from the Battle of Leyte Gulf, Pacific War operations, and postwar naval doctrine driven by the United States Navy. Built under shipyard programs influenced by Bureau of Ships studies, the class served into the Vietnam era before retirement amid shifts toward guided missiles and carrier aviation.
Design and development
Designed under the auspices of the Bureau of Ships and influenced by wartime experience in the Pacific Ocean Theater and campaigns such as Guadalcanal Campaign, the class aimed to surpass prewar heavy cruisers like Pensacola-class cruiser and Northampton-class cruiser. Naval architects at Bethlehem Steel Corporation and naval engineers associated with Philadelphia Naval Shipyard incorporated automated feed mechanisms for the main battery, improved fire control derived from programs at Naval Ordnance Laboratory and tactical concepts practiced by Cruiser Division 8 commanders. Treaty-era constraints from the Washington Naval Treaty and London Naval Treaty had expired, enabling displacement growth similar to contemporaneous designs from Royal Navy and Imperial Japanese Navy experience. The hull form reflected longitudinal strength standards developed at Newport News Shipbuilding and machinery layout concepts tested by USS Alaska (CB-1) and USS Guam (CB-2).
Armament and sensors
The primary battery comprised nine 8"/55 caliber automatic guns in three triple turrets, an innovation derived from trials at Naval Proving Ground Dahlgren and ordnance work at Indian Head Naval Surface Warfare Center. This permitted high cyclic rates compared to earlier 8-inch/55-caliber gun mounts used aboard ships like USS Portland (CA-33). Secondary weapons included dual-purpose 5"/38 caliber guns with directors tied into Mark 37 Gun Fire Control System installations, and layered close-in defense developed after engagements such as the Battle of Okinawa. Radar suites integrated sets from RCA and MIT Radiation Laboratory developments, including air-search and fire-control radars whose lineage traced to SCR-270 and postwar AN/SP family evolutions. Sonar and electronic warfare components reflected postwar advances at Naval Research Laboratory and procurement programs overseen by Office of Naval Research.
Service history
Commissioned ships entered service during the early Cold War and operated with fleets including United States Sixth Fleet in the Mediterranean Sea and United States Seventh Fleet in the Western Pacific. Crews participated in peacetime cruises, NATO exercises like Operation Mainbrace, and Cold War presence missions during crises such as the Suez Crisis and Cuban Missile Crisis era patrols. Several units supported carrier task forces; they provided naval gunfire support during Vietnam War operations, leveraging their rapid-fire 8-inch guns in coastal bombardment roles akin to older cruisers in the Korean War. Administrative control shifted among commands including Naval Gunfire Support elements and cruiser-destroyer flotillas formed under Commander, Naval Surface Forces Atlantic and Commander, Naval Surface Forces Pacific.
Ships in class
The class comprised three completed units: USS Des Moines (CA-134), USS Newport News (CA-148), and USS Salem (CA-139). Construction involved shipyards such as Bethlehem Steel, with keel-laying and launching events attended by notable figures from Department of the Navy and shipbuilding officials. Each hull carried unique histories: USS Des Moines undertook shakedown cruises and mid‑century deployments; USS Newport News engaged in Vietnam naval gunfire; USS Salem later served as a museum ship associated with civic organizations in Quincy, Massachusetts and Boston Harbor preservation efforts before eventual disposition. Decommissioning occurred during retrenchment associated with Nixon administration budget realignments and shifts toward guided-missile cruiser programs.
Modifications and modernizations
Throughout service, ships received modifications reflecting changing threats and technology transfers from programs at Naval Sea Systems Command and Naval Ordnance. Updates included radar upgrades sourced from Raytheon and Westinghouse systems, improvements to electronic countermeasures inspired by Electronic Warfare Division research, and alterations to anti-aircraft armament paralleling trends seen on Iowa-class battleship escorts. Proposals during the 1960s explored guided-missile conversions akin to refits considered for Baltimore-class cruiser units, but cost-benefit analyses by Secretary of the Navy staff led to retention of gun systems and incremental sensor upgrades instead. Habitability and engineering overhauls were performed under Naval Shipyard availabilities to extend operational life for wartime deployments.
Legacy and assessment
The Des Moines-class represented the culmination of gun cruiser design for the United States Navy and influenced assessments by analysts from Congressional Research Service and historians at institutions like Naval War College. Their automatic 8-inch guns provided a technological bridge between World War II ordnance and missile-era firepower, informing later designs in debates within Chief of Naval Operations planning cells. Preservation efforts, including museum service by USS Salem under local maritime museums and historical societies, contributed to public history and scholarship at Smithsonian Institution affiliates and regional maritime museum programs. Naval analysts compare their lifecycle costs and capabilities to contemporaneous missile cruisers such as USS Long Beach (CGN-9) and future classes debated in Byrd Amendment era funding discussions, concluding the class embodied late‑boom era engineering priorities before surface combatant doctrine shifted toward guided munitions and carrier aviation dominance.