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Landing Ship Medium
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A Landing Ship Medium (LSM) was originally an amphibious assault ship of the United States Navy in World War II. Of a size between that of Landing Ships Tank and Landing Craft Infantry, 558 LSMs were built for the USN between 1944 and 1945. Most of the vessels built on this frame were regular transports, but several dozen were converted during construction to specialized roles. Most LSMs were scrapped during the Cold War, but several were sold by the United States Department of Defense to foreign nations or private shipping companies.

OPNAV N95 established a new LSM program in 2020. The new LSM will be 350 to 400 feet (110 to 120 m) long, able to operate at 22 knots and have a range of 6,500 miles (10,500 km). The cost will be much lower than traditional amphibious shipping, according to a story in the March 2023 Marine Corps Gazette. The piece suggests that a MLR (Marine Littoral Regiment) would need nine LSMs.[1][2][3] As a comparison the Jason-class of the Greek Navy is about 380 feet (120 m) long, with a top speed of 18 knots

LSM-1-class Landing Ship Medium (Transport)

[edit]
USS LSM-175, of the LSM-1 class, while underway off Charleston Navy Yard in 1944
USS LSM-175 underway off Charleston Navy Yard in 1944
General characteristics
Class & typeLSM-1 class Landing Ship Medium
Displacement
  • 530 long tons (539 t) empty
  • 900 long tons (914 t) loaded
Length203 ft 6 in (62.03 m)
Beam34 ft (10 m)
Draft
  • Landing :
  • 3 ft 6 in (1.07 m) forward
  • 7 ft 8 in (2.34 m) aft
  • Full load :
  • 6 ft 4 in (1.93 m) forward
  • 8 ft 3 in (2.51 m) aft
PropulsionFairbanks-Morse or GM Cleveland diesel engines, 2,800 shp (2,088 kW), direct drive, 2 screws
Speed13.3 knots (24.6 km/h; 15.3 mph)
Range5,000 nmi (9,300 km) at 7 kn (13 km/h; 8.1 mph)
Capacity
Troops54 troops
Complement4 officers, 54 enlisted
Armament

List of LSM-1-class ships

[edit]

In total, 558 LSM ships were launched. Some notable examples include:

Name Year launched Fate Short summary
USS LSM-17 May 7, 1944 Sold on November 15, 1974
USS LSM-19 May 14, 1944 Unknown
USS LSM-20 May 14, 1944 Sank on December 5, 1944
USS LSM-45 June 30, 1944 Scrapped after 1998
USS LSM-46 June 30, 1944 Sold on October 23, 1948
USS LSM-56 July 21, 1944 Sold on October 23, 1948
USS LSM-60 July 29, 1944 Scuttled on July 25, 1946
USS LSM-105 October 21, 1944 Sold on December 10, 1958
USS LSM-110 October 28, 1944 Scrapped on June 9, 1976
USS LSM-115 November 11, 1944 Sold on December 29, 1946
USS LSM-125 November 25, 1944 Scrapped on October 4, 1977
USS LSM-135 April 23, 1944 Sank on May 25, 1945
USS LSM-149 May 27, 1944 Grounded on December 5, 1944
USS LSM-157 — Sank in September 1958 Transferred to Nationalist China in 1949, recommissioned as Mei Le, sunk by Red Chinese artillery 9/1958
USS Kodiak (LSM-161) June 27, 1944 Scrapped on August 14, 1972
USS Oceanside (LSM-175) August 3, 1944 Scrapped in 1989
USS LSM-216 — Scrapped in 1960
USS LSM-217 — Unknown
USS LSM-236 July 4, 1944 Scrapped in 1972
USS LSM-247 — Sold in February 1947
USS LSM-256 — Sank on June 16, 1969 Transferred to Nationalist China in 1949, recommissioned as Mei Hua, sunk in a collision with M.V. Ta Tung 16/6/69
USS LSM-275 September 11, 1944 Scrapped in 1976 Later renamed and reclassified USS Portunus (ARC-1)
USS LSM-297 October 30, 1944 Scrapped in 1958
USS LSM-315 — Unknown
USS LSM-319 — Sank in 1971
USS LSM-333 October 13, 1944 Scuttled on September 17, 2006
USS LSM-335 — — Later USNS LSM-335 (T-AG-335) Assigned Ryukyuan shuttle.[4]
USS LSM-338 December 5, 1944 Scrapped
USS LSM-355 December 2, 1944 Unknown
USS LSM-380 January 13, 1945 Waiting for preservation
USS LSM-397 January 6, 1945 Sold in November 1958
USS Hunting (LSM-398) January 6, 1945 Scrapped after 1983 Later reclassified (E-AG-398)
USS LSM-462 February 3, 1945 Unknown
USS LSM-469 February 17, 1945 Scuttled on February 1, 2003
USS LSM-471 February 17, 1945 Unknown
USS LSM-477 — Sank in 1971
USS LSM-478 March 3, 1945 Unknown
USS Raritan (LSM-540) August 1, 1945 Unknown
USS LSM-547 — Abandoned by 1972

LSM(R)-188-class Landing Ship Medium (Rocket)

[edit]
USS LSM(R)-194, of the LSM(R)-188 class, passing under the Cooper River Bridge, Charleston, SC, 2 December 1944
USS LSM(R)-194 passing under the Cooper River Bridge, Charleston, SC, 2 December 1944
General characteristics
Class & typeLSM(R)-188-class Landing Ship Medium (Rocket)
Displacement
  • LSM(R)-188 to LSM(R)-195 :
  • 968 long tons (984 t) loaded
  • LSM(R)-196 to LSM(R)-199 :
  • 1,008 long tons (1,024 t) loaded
Length203 ft 6 in (62.03 m)
Beam34 ft (10 m)
Draft
  • 5 ft 6 in (1.68 m) forward
  • 5 ft 9 in (1.75 m) aft
PropulsionGM Cleveland diesel engines, 2,800 shp (2,088 kW), direct drive, two screws
Speed13.2 knots (24.4 km/h; 15.2 mph)
Range5,000 nmi (9,300 km) at 7 kn (13 km/h; 8.1 mph)
Complement5 officers, 76 enlisted
Armament

LSM(R)-401-class Landing Ship Medium (Rocket)

[edit]
General characteristics
Class & typeLSM-401(R)-class Landing Ship Medium (Rocket)
Displacement1,175 long tons (1,194 t) loaded
Length203 ft 6 in (62.03 m)
Beam34 ft (10 m)
Draft7 ft 9 in (2.36 m)
PropulsionGM Cleveland diesel engines, 2,800 shp (2,088 kW), direct drive, two screws
Speed13 knots (24 km/h; 15 mph)
Range5,000 nmi (9,300 km) at 7 kn (13 km/h; 8.1 mph)
Complement6 officers, 137 enlisted
Armament

LSM(R)-501-class Landing Ship Medium (Rocket)

[edit]
USS Pee Dee River (LSM(R)-517), of the LSM(R)-501 class, underway in 1954
USS Pee Dee River (LSM(R)-517) underway in 1954
General characteristics
Class & typeLSM-501(R)-class Landing Ship Medium (Rocket)
Displacement1,175 long tons (1,194 t) loaded
Length203 ft 6 in (62.03 m)
Beam34 ft 6 in (10.52 m)
Draft7 ft 9 in (2.36 m)
PropulsionGM Cleveland diesel engines, 2,800 shp (2,088 kW), direct drive, two screws
Speed13 knots (24 km/h; 15 mph)
Range5,000 nmi (9,300 km) at 7 kn (13 km/h; 8.1 mph)
Complement6 officers, 137 enlisted
Armament

Gypsy-class salvage lifting vessels

[edit]
USS Gypsy (ARS(D)-1), lead ship of the Gypsy class, underway at Houston, TX, in 1946
USS Gypsy (ARS(D)-1) underway at Houston, Texas, in 1946
General characteristics
Class & typeGypsy-class salvage lifting vessels
Displacement816 long tons (829 t)
Length224 ft 9 in (68.50 m)
Beam34 ft 10 in (10.62 m)
Draft8 ft 4 in (2.54 m)
PropulsionFairbanks-Morse diesel engines, 1,440 shp (1,074 kW), direct drive, two screws
Speed13 knots (24 km/h; 15 mph)
Range4,900 nmi (9,100 km) at 12 kn (22 km/h; 14 mph)
Complement65 officers and enlisted
Armament2 × 20 mm AA guns

Production

[edit]

Dates are launch dates.[5]

Delivery:[5]

  • Q2 1944: 74
  • Q3 1944: 129
  • Q4 1944: 132
  • Q1 1945: 111
  • Q2 1945: 58
  • Q3 1945: 30
  • Q4 1945: 15
  • 1946: 9

Legacy

[edit]

One LSM, USS LSM-45, survived in its original configuration until around 2010. It was in storage at Marine Station Camp Lejeune in Jacksonville, North Carolina. It was slated to become the centerpiece of the Museum of the Marine, but due to changed plans, was scrapped between 2010 and 2014.[citation needed]

Light Amphibious Warship (LAW)

[edit]

As of February 2023 the US Marine Corps has proposed the purchase of 18 to 35 modern LSMs; this LSM concept was previously known as the Light Amphibious Warship (LAW).[6][7]

See also

[edit]

References

[edit]
[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Landing Ship Medium

View on Grokipedia
from Grokipedia
The Landing Ship Medium (LSM) was a class of amphibious assault ships developed and utilized by the during to transport and land troops, vehicles, and supplies directly onto hostile beaches via a bow ramp, serving as an intermediate vessel between smaller and larger tank landing ships. Introduced in 1944, the LSM class addressed the need for a more versatile amphibious vessel capable of ocean-going operations while maintaining the ability to beach and offload cargo efficiently, with a design that evolved from converted (LCT) hulls to purpose-built ships. A total of 558 LSMs and specialized LSM(R) (rocket) variants were constructed between 1944 and 1945, primarily by shipyards such as Brown Shipbuilding and Dravo Corporation, making them one of the most numerous amphibious ship types produced for the . These vessels measured 203 feet 6 inches in overall length, with a beam of 34 feet 6 inches, and displaced 520 tons light, 743 tons at landing load, and up to 1,095 tons fully loaded; they were powered by two Fairbanks-Morse diesel engines providing 2,800 shaft horsepower for a top speed of 13.2 knots and a range of 4,900 nautical miles at 12 knots. Armament typically included one twin 40 mm gun mount forward and four single 20 mm guns for self-defense, while capacity allowed for up to five medium tanks, three heavy tanks, or equivalent combinations of vehicles like LVTs or DUKWs, plus 48 troops (two officers and 46 enlisted). The crew consisted of five officers and 54 enlisted personnel. Primarily deployed in the Pacific Theater, LSMs played a in major amphibious operations, including the invasions of , Okinawa, and , where they supported Marine Corps and Army landings by delivering essential combat equipment and logistics under fire. The LSM(R) subclass, equipped with launchers for close , further enhanced their utility in providing suppressive barrages during assaults. Post-war, many LSMs were decommissioned by 1946, with some transferred to allied navies or repurposed, though a few saw service in the Korean and Vietnam Wars.

Introduction

Role and Purpose

The Landing Ship Medium (LSM) was a World War II-era employed by the , positioned as a medium-sized vessel that bridged the operational gap between the larger (LST)—capable of carrying heavy loads over long distances—and the smaller (LCI), which focused on troop delivery but lacked substantial vehicle capacity. This design optimization allowed the LSM to perform versatile beaching operations, transporting tanks, vehicles, equipment, and troops directly to hostile shores in support of Marine Corps and amphibious landings across the Pacific theater. The primary purpose of the LSM centered on enabling rapid unloading during assault operations through a prominent bow ramp and doors, which permitted vehicles such as up to five M4 medium tanks, six LVT amphibious tractors, or nine amphibious trucks to drive off onto beaches without requiring docking facilities. It could also accommodate approximately 48 troops—typically 2 officers and 46 enlisted men—alongside supplies, ensuring self-sustained support for initial establishment in island-hopping campaigns. This capability made the LSM essential for delivering combat power efficiently in shallow waters where larger ships could not approach. For self-defense during ocean transits and to offer limited near the objective, LSMs were typically armed with one twin 40 mm mount and four single 20 mm Oerlikon guns, though configurations varied as wartime needs evolved to enhance anti-aircraft protection. The standard crew numbered 5 officers and 54 enlisted men, responsible for , operation, and maintenance during extended voyages. Some LSMs were later converted to rocket variants (LSM(R)) equipped with launchers for saturation ahead of troop landings.

Development History

The development of the Landing Ship Medium (LSM) originated in the early amid escalating U.S. requirements for amphibious assault capabilities in the Pacific Theater during . By 1942-1943, operations such as the revealed limitations in existing vessels like the larger (LST), which, while effective for heavy cargo, were slow and cumbersome for rapid troop and vehicle deployments across island chains. The sought smaller, faster ships to supplement LSTs and bridge the gap with lighter (LCI), enabling more agile support for Marine Corps landings against Japanese defenses. This need was underscored by the intense demands of central Pacific advances, where efficient vehicle transport was critical to overcoming atolls and reefs. In late , the approved the LSM concept following urgent inquiries from Admiral , emphasizing cost-efficient designs for mass production to meet wartime timelines. The initial LSM design was an enlarged version of the LCT(7), incorporating a 34-foot-wide bow door and ramp for direct unloading, while drawing influences from the LCI's system for precise maneuvering. This hybrid approach allowed the LSM to carry up to five M4 medium tanks, or 36 tons of and general , or 147 tons of general only, significantly boosting capacity over predecessors without requiring entirely new . Contracts for LSM were awarded starting in , prioritizing to validate the design under combat conditions. Key milestones followed swiftly in 1944, with the keel of the , USS LSM-1, laid down on 15 February at Brown Shipbuilding Company in Houston, Texas. The first LSMs underwent prototype testing upon completion in April 1944, including sea trials to assess beaching performance and cargo handling, which confirmed the design's viability for Pacific operations. By mid-1944, production ramped up across multiple yards, delivering initial units ahead of schedules set by the . These early tests and launches marked the transition from conceptual planning to operational readiness, setting the foundation for the LSM's role in subsequent amphibious campaigns.

Transport Variant

LSM-1 Class Design and Specifications

The LSM-1 class represented a key evolution in U.S. Navy capabilities during , designed as a medium-sized landing ship optimized for transporting troops, vehicles, and cargo directly onto beaches via a bow ramp. These vessels filled a gap between smaller (LCI) and larger landing ship tanks (LST), offering improved speed and capacity for mechanized assaults in the Pacific and European theaters. The design emphasized shallow draft for beaching, robust construction for rough seas, and sufficient armament for self-defense against air and surface threats. In terms of displacement, the LSM-1 class ships measured 520 tons light, 743 tons at landing load, and 1,095 tons fully loaded, allowing them to carry substantial payloads without excessive draft that would hinder beach operations. Dimensions included a length of 203 feet 6 inches overall, a beam of 34 feet 6 inches, and a draft of 3 feet 6 inches forward (light) and 6 feet 4 inches (loaded), enabling effective grounding on varied shorelines while maintaining stability in open water. The crew consisted of 5 officers and 54 enlisted personnel, with a maximum payload of 150 tons. Propulsion was provided by two Fairbanks-Morse diesel engines delivering a total of 2,800 shaft horsepower to twin screws, achieving a maximum speed of 13.2 knots and a range of 4,900 nautical miles at 12 knots. This powerplant ensured reliable direct-drive performance suited to both transit and maneuvering during assaults. Capacity focused on mechanized support, with room for five medium tanks (such as the ) or three heavy tanks, or equivalent cargo space for six LVTs or nine DUKWs, accessed via a large bow ramp for rapid unloading. The design also accommodated up to 48 troops (two officers and 46 enlisted), though primary emphasis was on vehicle and supply transport rather than large complements. Armament typically consisted of one twin 40 mm Bofors gun mount forward and four single 20 mm Oerlikon guns for self-defense; slight variations occurred across individual ships, with some adding additional 20 mm mounts for enhanced anti-air capability. This configuration balanced offensive reach with the need to protect against low-flying aircraft and small craft during vulnerable beaching phases.

LSM-1 Class Production and Construction

The LSM-1 class landing ships were constructed using modular prefabrication techniques, which involved building ship sections in parallel at multiple sites within commercial shipyards before final assembly, enabling rapid production to support the U.S. Navy's amphibious needs during . This approach leveraged the capabilities of non-naval yards to accelerate output, with the first ship, LSM-1, laid down in February 1944 and commissioned in May 1944. A total of 557 units (LSM-1 to LSM-557) were built as the variant, with some later converted to rocket configurations. Production was distributed across several commercial and naval yards, with Brown Shipbuilding Company in Houston, Texas, as a primary builder, completing 254 ships from May 1944 to March 1946. Other key contractors included the Houston Shipbuilding Corporation, Dravo Corporation in , and the Charleston Navy Yard, utilizing inland and coastal facilities to maximize efficiency. Quarterly production rates reflected the program's and subsequent wind-down as wartime demands shifted:
QuarterNumber Built
Q2 74
Q3 129
Q4 132
Q1 1945111
Q2 194558
Q3 194530
Q4 194515
19469
This schedule, peaking at 132 ships in the final quarter of , demonstrated the effectiveness of in achieving , with all units entering service to bolster Pacific operations.

LSM-1 Class Operational History

The LSM-1 class landing ships primarily served in transport roles during , delivering troops, vehicles, and supplies to contested beaches in the Pacific Theater as part of the U.S. Navy's island-hopping strategy against Japanese forces. Their shallow draft and bow ramp enabled direct beaching and rapid unloading of medium tanks, , and other equipment, making them essential for supporting Marine and Army divisions in amphibious assaults. These vessels operated under the command of amphibious task forces, often facing enemy , mines, and aircraft while coordinating with larger landing ships like LSTs. In the Pacific, LSM-1 class ships played key roles in major landings, beginning with operations in the in late 1944. They supported the invasion by transporting Army units and cargo to beaches secured in October, followed by reinforcement missions during the landings in January 1945, where they beached under sporadic Japanese air attacks to unload vehicles and ammunition. The class's most intense combat employment came during the February 1945 assault on , where 31 LSMs from 53 delivered medium tanks—five per ship—and shore party equipment starting on D-Day, navigating heavy surf and volcanic ash that complicated retractions from the beach. LSM crews endured shellfire and operational hazards, resulting in 4 killed in action, 30 wounded in action, and 2 missing in action across the force during the operation. Similarly, in the Okinawa campaign—the largest amphibious operation of the war—LSMs shuttled troops, supplies, and reinforcements to the Hagushi beaches amid relentless assaults, sustaining the ground forces through sustained logistics runs despite the fleet's exposure to over 1,900 enemy aircraft sorties. A smaller number of LSM-1 class ships operated in the Atlantic for training exercises off the U.S. East Coast and provided limited support in the European Theater, including follow-on logistics after the June 1944 , though the class's production timeline restricted their direct involvement in initial D-Day assaults. Following 's surrender in August 1945, surviving LSM-1 class vessels shifted to occupation duties in the Pacific through 1946, ferrying U.S. occupation troops to ports in and supporting repatriation efforts in ; for instance, USS LSM-349 navigated the River to deliver supplies and evacuate personnel in late 1945. Throughout the , the LSM-1 class suffered significant attrition, with 9 ships lost primarily to enemy action in the Pacific, including groundings, strikes, and hits during beaching operations.

List of LSM-1 Class Ships

The LSM-1 class comprised 557 vessels constructed for the U.S. during , numbered sequentially from LSM-1 to LSM-557 and commissioned primarily between May 1944 and October 1945 across multiple shipyards. These ships served extensively in amphibious operations, with many decommissioned postwar and disposed of through scrapping, sale for commercial use, or transfer to allied navies such as those of and ; a small number were lost during service due to enemy action or accidents. For a complete list, see individual hull entries on NavSource. Notable losses included LSM-20 (sunk by 5 December 1944 off ), LSM-59 (grounded off Okinawa 21 June 1945), LSM-135 ( off Okinawa 25 May 1945), and LSM-318 ( off 7 December 1944). Postwar, examples like USS LSM-325 were renamed USS Grafton and served until 1955 before scrapping. Several were transferred, e.g., LSM-99 to as Ourka, LSM-47 to Turkish as TCG Sancaktar, serving into the 1970s.

Rocket Variants

LSM(R) Design Modifications

The LSM(R) variants were developed by converting standard LSM-1 class hulls to serve as rocket-equipped ships, primarily through structural alterations to the deck and bow area. The open , originally designed for loading vehicles and troops in the transport configuration, was covered over to provide additional space for storing rocket ammunition below decks and mounting on the main deck. The bow ramp were sealed shut to enhance seaworthiness and prevent flooding, transforming the vessel from an amphibious transporter into a dedicated bombardment platform. These modifications were implemented starting in late on twelve LSM hulls to meet urgent needs for close-in shore support during Pacific amphibious operations. Rocket armament was added via multiple launch rails and projectors designed for 5-inch spin-stabilized rockets, capable of delivering rapid barrages over ranges up to 4,000 yards. Early conversions like the LSM(R)-188 class featured manually loaded rail-type , typically comprising 75 four-rail Mark 36 projectors and 30 six-rail Mark 30 projectors, providing between 300 and 480 individual tubes in total across configurations. Later variants incorporated automatic, power-driven , with 8 to 10 twin-tube units per ship, each capable of firing up to 30 rockets per minute for a combined rate of 300 rockets per minute. Armament also included one 5-inch/ dual-purpose gun for longer-range fire, one twin 40 mm mount positioned forward for anti-aircraft defense, and multiple single 20 mm Oerlikon guns (usually 4 to 12) distributed along the deck for close protection. Four 4.2-inch chemical mortars were sometimes fitted for additional high-angle fire support. Enhanced fire control systems, including radar-directed directors for the 5-inch gun and anti-aircraft batteries, were integrated to improve accuracy during shore bombardment missions. The added weight of rocket ammunition, launchers, and reinforced deck structures resulted in increased displacement compared to the baseline LSM-1, with the LSM(R)-188 class reaching approximately 968 tons when loaded and up to 1,008 tons in some configurations due to ammunition loads. Maximum speed was slightly adjusted to 13.2 knots for the LSM(R)-188 class under loaded conditions, while later classes achieved 13 knots, maintaining operational compatibility with amphibious task forces despite the heavier armament. These changes prioritized firepower over transport capacity, enabling the LSM(R) to deliver devastating salvos equivalent to a light cruiser in volume, though with limitations in range and sustained fire.

LSM(R)-188, 401, and 501 Classes

The LSM(R)-188 class comprised 12 ships, numbered LSM(R)-188 through LSM(R)-199, all constructed in primarily at the Charleston Navy Yard. These vessels had a loaded displacement ranging from 968 to 1,008 tons; ships 188-195 were equipped with 75 four-rail Mark 36 and 30 six-rail Mark 30 rocket launchers (480 tubes total), while 196-199 featured 85 Mk 51 hopper-type launchers, all designed to launch 5-inch rockets for inshore . The LSM(R)-401 class represented an intermediate subclass, with 12 ships built in 1945, numbered LSM(R)-401 to LSM(R)-412, at specialized shipyards including the Charleston Navy Yard and Brown Shipbuilding Company. Featuring a loaded displacement of 1,175 tons, these ships incorporated 10 twin-tube Mk 102 automatic rocket launchers (20 tubes total) and design enhancements for improved stability to better handle the added weight of the rocket armament. The LSM(R)-501 class consisted of 36 ships, numbered LSM(R)-501 to LSM(R)-536, completed in late 1945 at Brown Shipbuilding Company. Similar in displacement and overall configuration to the 401 class but approximately 3 feet longer with a , these vessels supported advanced rocket firing controls. In total, 60 LSM(R) ships were constructed across these subclasses, utilizing yards specialized in amphibious vessel production such as the Charleston Navy Yard and . The rocket armaments across classes typically included rail-mounted launchers like the Mk 36 and Mk 30 for the earlier 188 class, transitioning to more automated twin-tube Mk 102 systems in the 401 and 501 classes.

LSM(R) Operational Deployments

The LSM(R)-188 class ships arrived in the Pacific theater in early 1945 and contributed to operations off in February-March, providing saturation barrages during the later phases of the initial assaults on the island's beaches. These vessels, equipped with multiple , delivered high-volume 5-inch fire to neutralize Japanese defenses in the Motoyama area, supplementing from larger warships. Their role emphasized close-in saturation attacks, though operations were limited by the class's recent arrival and ongoing transit challenges. In the Okinawa campaign from April to June 1945, LSM(R) ships from the 188, 401, and 501 classes were heavily employed for , targeting shore defenses and providing anti-kamikaze for amphibious forces. Operating off Kerama Retto and the main island, they unleashed thousands of rockets in coordinated barrages, such as those on 26 March against preliminary objectives, devastating enemy positions and supporting landings despite intense aerial threats. For instance, LSM(R)-188 conducted harassment patrols and engaged kamikazes, firing rockets while enduring attacks that resulted in significant casualties and damage to several sister ships, including sinkings during Kikusui operations. Following Okinawa, LSM(R)s participated in limited mopping-up operations in the , providing intermittent support to clear remaining Japanese holdouts. These deployments were curtailed by the war's end, with the ships transitioning to non-combat roles. Overall, LSM(R) vessels significantly enhanced close-in for amphibious assaults, offering destroyer-class ships a concentrated capability that saturated defenses more effectively than traditional naval gunfire alone. Most were decommissioned in 1946, seeing no further combat deployments after the Pacific War.

Auxiliary and Converted Vessels

Gypsy Class Salvage Vessels

The Gypsy-class salvage vessels were a small group of four ships (ARS(D)-1 through ARS(D)-4) designed for harbor clearance and heavy-lift salvage operations, converted from Landing Ship Medium (LSM) hulls during their construction in 1945–1946. Originally ordered as LSM-549 to LSM-552 at the Brown Shipbuilding Company in , , these vessels were reclassified as Auxiliary Rescue Salvage Diving ships on 24 April 1945 to meet needs for mobile salvage capabilities in shallow waters. The conversions involved sealing the bow doors and ramps, transforming the former deck into a dedicated salvage hold, and installing specialized equipment, allowing the ships to operate effectively in littoral environments where larger salvage vessels could not maneuver. These vessels measured 224 feet 9 inches in , with a beam of 34 feet 10 inches and a light displacement of 816 tons, powered by two Fairbanks-Morse diesel engines providing 2,800 horsepower via direct drive to twin screws for a top speed of 13 knots. Key modifications included heavy-lift gear such as lifting horns and 100-ton capacity cranes for raising submerged objects up to 365 tons using sixfold purchase systems, along with salvage pumps for , pontoons, and beach gear for refloating operations; diving bells were incorporated to support inspections and repairs. Armament was minimized to prioritize utility, consisting initially of two single 20 mm guns, later reduced to a single twin 20 mm mount on the lead ships for basic . The primary role of the Gypsy class was to lift sunken ships, clear wrecks from harbors, and perform underwater repairs in support of naval , leveraging the inherent shallow-draft design of the LSM hull for access to beaches and restricted waters. The ships participated in at in 1946, conducted salvage operations in the Pacific including recovering wreckage from typhoon-damaged vessels near Okinawa, and supported efforts in European waters and during the era, such as riverine salvage. Commissioned between February and April 1946—USS Gypsy (ARS(D)-1) on 28 February, USS Mender (ARS(D)-2) on 8 March, USS Salvager (ARS(D)-3) on 22 March, and USS Windlass (ARS(D)-4) on 9 April—these ships filled a niche for rapid-response salvage in the immediate postwar period. Most were placed in reserve by the 1950s, with Windlass sunk in 1968 during Vietnam service and the class transferred to civilian operators by 1973.

Other Post-War Conversions

Following , a number of LSM-1 class ships underwent conversions for mine countermeasures roles, primarily through transfers to allied navies where they were modified with sweep gear and other equipment. For instance, LSM-86 was transferred to in 1948 as BDM No. 42 and subsequently converted into the minesweeper , which remained in service until 1972 before transfer to . These adaptations leveraged the LSM's sturdy hull and propulsion for coastal and riverine mine sweeping operations in the post-war period. Some LSMs were repurposed for training and target purposes within the U.S. Navy, including conversions to support testing and drone operations. USS LSM-446, for example, was converted into a test and evaluation ship in 1947 and redesignated E-LSM-446 in July 1947, serving in experimental roles through the late 1940s. Such vessels provided platforms for evaluating anti-aircraft systems and controls, contributing to Cold War-era naval advancements without extensive structural overhauls. Foreign transfers often involved modifications for auxiliary combat roles, particularly in allied Mediterranean navies during the 1950s. The acquired six LSM-1 class ships in 1958 under the Mutual Defense Assistance Program and used them for patrol and amphibious support duties. A representative example is former USS LSM-45, transferred to on November 3, 1958, and recommissioned as Ypoploiarchos Grigoropoulos (L-161), which served until decommissioning in 1993. These conversions enhanced regional deterrence and amphibious support for allies. In the , several surplus LSMs were sold in the late and for civilian applications, often as or scrap haulers after minimal modifications to remove fittings. LSM-135, laid up in 1946, was sold to Hugo Neu in 1959 and converted into a , though it was later wrecked in in 1963. Similarly, LSM(R)-407 was sold to the Tacoma Tug & Barge Company in 1960 and refitted as a commercial . These dispositions reflected the Navy's drawdown, with out of the 558 LSM-1 class ships built, many finding non- utility in towing, cargo, or salvage operations.

Overall Production

Production Statistics and Timeline

The production of Landing Ship Medium (LSM) vessels during totaled 558 ships, encompassing both standard transport variants and rocket-equipped modifications. This figure includes 498 standard LSMs designed primarily for troop and vehicle transport, along with 60 LSM(R) variants configured for fire support roles, comprising 12 conversions from existing LSM hulls (LSM(R)-188 through 199) and 48 purpose-built ships (LSM(R)-401 through 412 and 501 through 536). The first LSM entered service in April 1944, with production accelerating rapidly thereafter as multiple shipyards ramped up output to meet demands for Pacific theater amphibious operations. Peak construction occurred between and , when approximately 90% of the fleet (over 500 ships) was completed within an intensive 18-month span, driven by wartime priorities that prioritized speed over extensive testing or refinements. Deliveries continued into early 1946, with the final standard LSM (LSM-545) commissioned in January of that year. In the immediate aftermath of V-J Day on August 15, 1945, the U.S. Navy cancelled numerous outstanding contracts across its shipbuilding programs, affecting LSM production and leaving a small number of hulls incomplete or diverted to other uses. Post-war, four LSM hulls were converted into the Gypsy-class salvage lifting vessels (ARS(D)-1 through 4), enhancing the Navy's recovery capabilities but not counted in the primary wartime LSM totals.

Shipyards and Builders

LSM vessels were constructed by six primary shipyards during World War II: These yards collectively produced all 558 LSM and LSM(R) vessels, with Brown Shipbuilding handling the majority of the output.

Legacy

Post-War Service and Disposal

Following the conclusion of , the majority of the 558 Landing Ship Medium (LSM) vessels were decommissioned between late 1945 and 1947, with many placed into reserve fleets for potential future use. For instance, USS LSM-201 was decommissioned on May 16, 1946, at , and sold for scrapping later that year. Similarly, USS LSM-216 was decommissioned on May 2, 1946, at , and struck from the Naval Register. USS LSM-242 followed suit on December 28, 1945, at San Pedro, . These vessels were typically laid up in locations such as the Pacific Reserve Fleet's Group or Atlantic Reserve Fleet sites, where they remained mothballed through the early 1950s, allowing for limited recommissioning during the ; USS LSM-362, for example, was recommissioned on October 14, 1950, for service in that conflict before returning to reserve status. At least 70 LSMs were transferred to allied nations during the era as part of U.S. programs, enhancing foreign amphibious capabilities. Notable examples include transfers to France, where 11 vessels were redesignated as (LSI) for operations in Indochina; USS LSM-422 was among those handed over on February 5, 1954, before being returned to U.S. custody in March 1956 and subsequently transferred to as ROU 21 Payaguá. To , six LSMs were provided, often converted for minelaying roles; USS LSM-481 became TCG Marmaris (N-103) in 1950 and served until decommissioning in 1990, while USS LSM-484 was renamed TCG Mordogan (N-101). Additional transfers went to countries such as , , and the of China, with some later seized by communist forces in 1949. A smaller number were sold to private entities for conversion to merchant marine use, supporting commercial shipping needs. The bulk of LSMs met their end through scrapping, with approximately 80% dismantled between 1947 and the 1960s under the oversight of the Maritime Administration (MARAD), which managed the disposal of obsolete vessels from the . Early examples include USS LSM-1, sold to Boston Metals Company for scrapping in 1947, and numerous others auctioned to firms like Georgia Marine Salvage that same year. Scrapping continued into later decades, with a major wave in the ; USS LSM-236, for instance, was broken up in 1972. MARAD's process ensured environmentally controlled dismantling, recovering materials while adhering to federal disposal protocols established post-war. One notable incident involved USS LSM-45, which had been transferred to the Greek Navy as RHS Ypoploiarchos Grigoropoulos (L161) on November 3, 1958, and served until returned to the U.S. in 1993 for preservation as a by USS Ship Memorial, Inc. Efforts to restore the vessel failed due to funding shortages and structural deterioration, leading to its declaration as unsafe in 2012 and eventual scrapping between 2010 and 2014 at an undisclosed facility. This case highlighted the challenges of preserving aging wartime hulls amid shifting priorities for naval heritage.

Preservation and Surviving Examples

The only known surviving example of a World War II-era Landing Ship Medium (LSM) is the MV Salvage Chief (ex-USS LSM-380), which remains in private ownership and operational use as a salvage vessel based in Astoria, Oregon. Originally commissioned in 1945, LSM-380 was sold in 1948 to Fred Devine for conversion into a commercial salvage ship, where it has since supported maritime recovery operations along the Columbia River and beyond, enduring over 80 years of service without major structural loss. As of 2025, the vessel continues to offer public tours and is maintained by the Salvage Chief Foundation, highlighting its role in preserving LSM design elements such as the bow ramp and cargo well amid ongoing restoration efforts. Efforts to preserve additional LSMs for museum display have largely failed due to structural deterioration and insufficient funding. USS LSM-45, transferred post-war to the as Ypoploiarchos Grigoropoulos (L-161) before returning to U.S. hands in 1993, was donated in 2003 to the Amphibious Forces Memorial Museum with plans for exhibit at Camp Lejeune, ; however, corrosion rendered it unseaworthy, leading to its scrapping around 2012. USS LSM-19 was transferred to the South Korean Navy in 1956 as ROKS Girin (LSM-610) and served until decommissioned on February 28, 1999; its fate after 1999 remains unknown as of 2025, with no verified records of further disposal or survival despite searches through naval archives. In lieu of intact hulls, LSM legacy is commemorated through memorials and artifacts at key historical sites. Plaques honoring amphibious forces, including LSM contributions to operations like , are installed at invasion beaches and associated monuments, such as those at the Marine Corps War Memorial in Arlington, . Scale models of LSM vessels are displayed in naval museums, including the National Museum of the United States Navy in Washington, D.C., providing educational insight into their role in Pacific Theater landings without relying on deteriorating originals. These limited preservation outcomes stem from widespread challenges, including hull corrosion from saltwater exposure and inadequate funding for of obsolete steel-hulled ships, resulting in the scrapping or loss of nearly all of the 558 LSMs built.

Modern Developments

Light Amphibious Warship Program Origins

The origins of the Light Amphibious Warship () program trace back to the U.S. Marine Corps' initiative, which began development in 2018 and was formally outlined in the 2019 Commandant's Planning Guidance. Then-Commandant Gen. David H. Berger proposed the LAW concept in 2019 as a key element of this overhaul, aimed at restructuring the Marine Corps for high-end combat against near-peer adversaries, particularly in the . The program's rationale centered on the need for distributed maritime operations (DMO) and expeditionary advanced base operations (EABO) to counter China's anti-access/area-denial (A2/AD) capabilities in contested littorals. It envisioned small, survivable vessels to enable Marine Littoral Regiments (MLRs) in rapid, maneuverable island-hopping campaigns, providing intra-theater connectivity between islands and austere shores while minimizing vulnerability to precision strikes. This approach echoed the beaching role of II-era Landing Ship Medium (LSM) vessels in supporting distributed amphibious assaults. The U.S. Navy formally established the LAW program in 2020, conducting industry studies that July to refine requirements, with the designation later changed to Medium Landing Ship (LSM) in 2023 to reflect its role as a to the 1940s LSM class—emphasizing shallow-draft, low-cost amphibious lift for beaching operations. Influenced by the historical LSM's proven utility in Pacific island campaigns, the modern program prioritizes stern ramps to interface with connectors like (LCACs) for efficient shore-to-shore logistics. Initial requirements called for 18 to 35 ships, with the Marine Corps advocating for up to 35 to equip three planned MLRs at approximately nine vessels per , plus spares for maintenance cycles, ensuring persistent presence in contested environments.

LAW Design and Requirements

The Light Amphibious Warship (LAW), later redesignated as the Medium Landing Ship (LSM), draws inspiration from the historical role of World War II-era Landing Ship Medium (LSM) vessels in providing agile, beaching-capable transport for troops and equipment in littoral environments. Early LAW/LSM design requirements emphasized affordability, simplicity, and interoperability with Marine Corps Expeditionary Advanced Base Operations (EABO) concepts, targeting a of 200-400 feet, displacement of 1,000-4,000 tons, maximum draft of 12 feet, sustained speed of 14-22 knots, and range of 3,500-6,500 nautical miles. As of 2025, to accelerate procurement, the shifted to non-developmental designs such as the Israeli Shipyards' ILSV (295 feet , 1,800 tons displacement, 16 knots speed, ~4,000 nautical miles range) and Damen's LST-100 (328 feet , 4,000 tons displacement, 15 knots speed, 5,000 nautical miles range at 12 knots), both with ~12 feet draft, with the latter selected in December 2025 by NAVSEA as the basis for the LSM program. Capacity requirements focus on supporting small, mobile Marine Littoral Regiments (MLRs), accommodating up to 75 Marines with their equipment for up to two weeks of independent operations. Cargo capacity includes up to 200 tons of supplies, vehicles, or munitions, with flexibility to alternatively support aviation operations such as four MV-22 Ospreys for rapid troop insertion. An aft aviation deck is mandated to enable , helicopter landings, and launches, enhancing the ship's role in contested logistics without requiring full fixed-wing capabilities. Armament is limited to defensive systems to control costs and reduce signatures, including machine guns such as .50-caliber mounts and potential electronic warfare (EW) suites for countering small threats, explicitly excluding heavy offensive weapons like missiles or large-caliber guns. Key design features include a bow ramp for direct offload onto beaches (with some designs featuring both bow and ramps), modular mission bays for reconfigurable storage of cargo, weapons, or command equipment, and extensive use of (COTS) components to achieve a target of $100-150 million. These elements prioritize non-developmental hull forms to accelerate procurement while ensuring a 20-year . In the October 2025 Force Design update, the Marine Corps reaffirmed a minimum requirement of 31 amphibious ships in the total inventory to sustain EABO and distributed operations, integrating the LAW/LSM as a core enabler alongside larger assault ships.

Procurement and Status as of 2025

The U.S. Navy's Fiscal Year 2025 (FY2025) budget request included $268.1 million for procurement of the lead Medium Landing Ship (LSM), formerly known as the Light Amphibious Warship (LAW), to initiate construction of the first vessel in the class. This funding supported advance procurement activities, with the Navy planning to award the detail design and construction contract for the lead ship later in the fiscal year following a competitive process. Although the initial target for the full construction contract was March 2025, the award was delayed due to industrial base challenges and requirements refinement, resulting in a $9.5 million contract for long-lead time materials and engineering awarded to Bollinger Shipyards on September 29, 2025, for adaptation of the Israeli Shipyards' ILSV design. The Navy's strategy envisions acquiring 18 to 35 LSMs to meet Marine Corps needs for distributed maritime operations, with the FY2025 five-year defense plan (FY2025–FY2029) requesting funding for 1 ship in FY2025, 1 in FY2026, and 3 in FY2027 (total of 5). Under the broader 30-year plan, the first LSM is scheduled for procurement in FY2025, followed by 2 to 3 ships annually from FY2027 through 2040, aiming to integrate with the existing amphibious fleet to achieve a total of at least 31 amphibious ships. The program emphasizes a ramp-up in production rates to 5 ships per year once mature, targeting delivery of the lead vessel in 2028 to support operational timelines. Competition for construction contracts involves Gulf Coast shipbuilders, including in and in , with the prioritizing non-developmental to accelerate acquisition. Bollinger's selection for initial long-lead procurement reflects its experience in commercial and military vessel construction, while remains a contender for subsequent awards; the also acquired rights to Damen's LST-100 in 2025 for . In December 2025, NAVSEA selected the Damen LST-100 as the design basis for the LSM program. This approximately 100-meter, 4,000-ton vessel can embark about 250 Marines, has a range of around 4,000 nautical miles, and supports multi-mission roles including amphibious landings, troop and vehicle transport, patrols, reconnaissance, surveys, and humanitarian or disaster relief operations. Up to 35 such vessels are planned to be constructed in U.S. shipyards. The program is integrated with the San Antonio-class LPD-17 Flight II amphibious transport dock efforts to enhance overall expeditionary capabilities. As of December 2025, the LSM program remains active with the selection of the Damen LST-100 design and no reported cancellations in the latest Marine Corps Force Design Update from October 2025, despite ongoing challenges such as award delays and potential cost overruns. An April 2024 (CBO) analysis estimated LSM per-unit procurement costs at $340-430 million, more than double the 's $150 million target. The January 2025 CBO analysis of the 's shipbuilding plan estimated total costs about 25 percent higher than Navy projections due to labor shortages and issues in the industrial base. These factors have prompted , but funding for FY2025 has been appropriated, supporting continued progress toward the long-term goal of 35 ships by 2035.

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