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ALanding Ship Medium (LSM) was originally anamphibious assault ship of theUnited States Navy inWorld War II. Of a size between that ofLanding Ships Tank andLanding 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 theCold War, but several were sold by theUnited 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 2023Marine Corps Gazette. The piece suggests that a MLR (Marine Littoral Regiment) would need nine LSMs.^[1][2][3] As a comparison theJason-class of the Greek Navy is about 380 feet (120 m) long, with a top speed of 18 knots

USSLSM-175 underway off Charleston Navy Yard in 1944
General characteristics
Class & type	LSM-1 class Landing Ship Medium
Displacement	530 long tons (539 t) empty 900 long tons (914 t) loaded
Length	203 ft 6 in (62.03 m)
Beam	34 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
Propulsion	Fairbanks-MorseorGM Clevelanddiesel engines, 2,800 shp (2,088 kW), direct drive, 2 screws
Speed	13.3knots (24.6 km/h; 15.3 mph)
Range	5,000 nmi (9,300 km) at 7 kn (13 km/h; 8.1 mph)
Capacity	5 ×medium tanksor 3 ×heavy tanks (150 tons max. payload, beaching)or 6 ×LVTsor 9 ×DUKWs
Troops	54 troops
Complement	4 officers, 54 enlisted
Armament	Up to 2 ×40 mm AA guns 4-6 ×20 mm AA guns (typically 4 if Bofors shipped)

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

USSLSM(R)-194 passing under the Cooper River Bridge, Charleston, SC, 2 December 1944
General characteristics
Class & type	LSM(R)-188-class Landing Ship Medium (Rocket)
Displacement	LSM(R)-188 toLSM(R)-195 : 968 long tons (984 t) loaded LSM(R)-196 toLSM(R)-199 : 1,008 long tons (1,024 t) loaded
Length	203 ft 6 in (62.03 m)
Beam	34 ft (10 m)
Draft	5 ft 6 in (1.68 m) forward 5 ft 9 in (1.75 m) aft
Propulsion	GM Clevelanddiesel engines, 2,800 shp (2,088 kW), direct drive, two screws
Speed	13.2knots (24.4 km/h; 15.2 mph)
Range	5,000 nmi (9,300 km) at 7 kn (13 km/h; 8.1 mph)
Complement	5 officers, 76 enlisted
Armament	LSM(R)-188 toLSM(R)-195 : 1 ×5"/38 caliber gun 2 ×40 mm AA guns 3 ×20 mm AA guns 85 × Mk. 51 automatic rocket launchers LSM(R)-196 toLSM(R)-199 : 1 ×5"/38 caliber gun 2 ×40 mm AA guns 75 × 4-rail Mk. 36 rocket launchers 30 × 6-rail Mk. 30 rocket launchers 85 × Mk. 51 automatic rocket launchers

• USS LSM(R)-188
• USS LSM(R)-189
• USS LSM(R)-190
• USS LSM(R)-191
• USS LSM(R)-192
• USS LSM(R)-193
• USS LSM(R)-194
• USS LSM(R)-195
• USS LSM(R)-196
• USS LSM(R)-197
• USS LSM(R)-198
• USS LSM(R)-199

• USS Big Black River(LSM(R)-401), later reclassified (LFR-401)
• USS Big Horn River(LSM(R)-402)
• USS Blackstone River(LSM(R)-403)
• USS Black Warrior River(LSM(R)-404), later reclassified (LFR-404)
• USS Broadkill River(LSM(R)-405), later reclassified (LFR-405)
• USS Canadian River(LSM(R)-406)
• USSChariton River (LSM(R)-407)
• USS Charles River(LSM(R)-408)
• USSClarion River (LSM(R)-409), later reclassified (LFR-409)
• USS Clark Fork River(LSM(R)-410)
• USS Cumberland River(LSM(R)-411)
• USS Desplaines River(LSM(R)-412), later reclassified (LFR-412)

USSPee Dee River (LSM(R)-517) underway in 1954
General characteristics
Class & type	LSM-501(R)-class Landing Ship Medium (Rocket)
Displacement	1,175 long tons (1,194 t) loaded
Length	203 ft 6 in (62.03 m)
Beam	34 ft 6 in (10.52 m)
Draft	7 ft 9 in (2.36 m)
Propulsion	GM Cleveland diesel engines, 2,800 shp (2,088 kW), direct drive, two screws
Speed	13knots (24 km/h; 15 mph)
Range	5,000 nmi (9,300 km) at 7 kn (13 km/h; 8.1 mph)
Complement	6 officers, 137 enlisted
Armament	1 ×5"/38 caliber gun 4 ×40 mm AA guns 8 ×20 mm AA guns 4 × 4.2 in (110 mm) mortars 20 × continuous loading 5-inch (130 mm) Ship-to-shore rocket launchers

• USS Elk River(LSM(R)-501), later reclassified (IX-501)
• USS Escalanteo River(LSM(R)-502)
• USS Flambeau River(LSM(R)-503)
• USS Gila River(LSM(R)-504)
• USS Grand River(LSM(R)-505)
• USS Green River(LSM(R)-506)
• USSGreenbrier River (LSM(R)-507)
• USSGunnison River (LSM(R)-508), later reclassified and renamedUSSTargeteer (YV-3)
• USS Holston River(LSM(R)-509)
• USS James River(LSM(R)-510)
• USS John Day River(LSM(R)-511)
• USS Lamiolle River(LSM(R)-512), later reclassified (LFR-512)
• USS Laramie River(LSM(R)-513), later reclassified (LFR-513)
• USS Maurice River(LSM(R)-514)
• USS Owyhee River(LSM(R)-515), later reclassified (LFR-515)
• USS Pearl River(LSM(R)-516)
• USSPee Dee River (LSM(R)-517)
• USS Pit River(LSM(R)-518)
• USSPowder River (LSM(R)-519)
• USS Raccoon River(LSM(R)-520)
• USS Rainy River(LSM(R)-521)
• USS Red River(LSM(R)-522), later reclassified (LFR-522)
• USS Republican River(LSM(R)-523)
• USSSaint Croix River (LSM(R)-524)
• USSSt. Francis River (LSM(R)-525), later reclassified (LFR-525)
• USS St. Johns River(LSM(R)-526)
• USSSt. Joseph's River (LSM(R)-527)
• USSSt. Mary's River (LSM(R)-528)
• USSSt. Regis River (LSM(R)-529)
• USS Salmon Falls River(LSM(R)-530)
• USS Smoky Hill River(LSM(R)-531), later reclassified (LFR-531)
• USS Smyrna River(LSM(R)-532)
• USS Snake River(LSM(R)-533)
• USS Thames River(LSM(R)-534)
• USS Trinity River(LSM(R)-535)
• USSWhite River (LSM(R)-536), later reclassified (LFR-536)

USS Gypsy (ARS(D)-1) underway at Houston, Texas, in 1946
General characteristics
Class & type	Gypsy-class salvage lifting vessels
Displacement	816 long tons (829 t)
Length	224 ft 9 in (68.50 m)
Beam	34 ft 10 in (10.62 m)
Draft	8 ft 4 in (2.54 m)
Propulsion	Fairbanks-Morse diesel engines, 1,440 shp (1,074 kW), direct drive, two screws
Speed	13knots (24 km/h; 15 mph)
Range	4,900 nmi (9,100 km) at 12 kn (22 km/h; 14 mph)
Complement	65 officers and enlisted
Armament	2 ×20 mm AA guns

• USS Gypsy (ARS(D)-1), authorized asLSM-549
• USSMender (ARS(D)-2), authorized asLSM-550
• USSSalvager (ARS(D)-3), authorized asLSM-551, later reclassified to YMLC-3
• USSWindlass (ARS(D)-4), authorized asLSM-552, later reclassified to YMLC-4

Dates are launch dates.^[5]

• Brown Shipbuilding:Houston, TX:254 (May 1944 - Apr 1946)
  • purpose-built yard for the war effort
• Charleston Navy Yard,North Charleston, SC:121 (May 1944 - Nov 1945)
  • traditional military yard
• Dravo Corporation,Wilmington, DE:65 (Apr 1944 - May 1945)
  • purpose-built yard for the war effort
• Pullman Company,Chicago, IL:44 (May 1944 - May 1945)
  • traditional rail car manufacturer
• Federal Shipbuilding and Drydock Company,Newark, NJ:42 (May 1944 - Feb 1945)
  • traditional civil and military yard
• Western Pipe and Steel,San Pedro, CA:32 (Aug 1944 - Mar 1945)
  • traditional civil yard

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

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

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]

• List of United States Navy Landing Ship Mediums
• Landing Ship, Infantry
• Mark 8 Landing Craft Tank

• LSM-LSMR: WWII Amphibious Forces, Turner Publishing Co.; Paducah, Kentucky,ISBN 1-56311-140-3
• Jane's Fighting Ships, 1980–81
• US Navy, ONI 226, Allied Landing Craft and Ships, April 1944

• USS LSM/LSMR Association
• NavSource Photo Archives
• Landing Shipsibiblio.org
• My Life Aboard the LSM-319 by Eugene Carey
• The Navy's Smallest Aircraft Carrier, July 1958, Popular Mechanics small article on conversion of LSM-445 to a target drone launching vessel

• Lists of ships of the United States
• Landing ships of the United States Navy
• Ship classes of the French Navy

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