LCI (Landing Craft, Infantry)

LCI (Landing Craft, Infantry)
Name	Landing Craft, Infantry
Caption	LCI underway, World War II
Type	Amphibious assault ship
Service	1941–1960s
Used by	United States Navy, Royal Navy, Royal Canadian Navy
Wars	World War II, Korean War
Displacement	250–450 tons (varied)
Length	158–174 ft (varied)
Beam	23–30 ft (varied)
Speed	15–16 knots (varied)
Complement	3 officers, 24–30 enlisted (varied)

LCI (Landing Craft, Infantry) was a class of amphibious assault vessels designed to transport and land large numbers of infantry directly onto hostile beaches during World War II. Built principally by United States shipyards and used by Allied navies including the Royal Navy and Royal Canadian Navy, LCIs saw service in multiple theaters such as the European theatre of World War II and the Pacific War. Their shallow draft, simple construction, and relatively large troop-carrying capacity made them a key element of combined operations alongside LST, LCVP, and APC types.

Design and Development

Design work for LCIs began in the prelude to United States entry into World War II as the United States Navy sought a vessel larger than the Higgins boat but smaller and more maneuverable than a troopship. Early designs drew on hull-form experience from Elco Motor Yacht Company and Bath Iron Works prototypes, balancing displacement and beaching capability. The resulting standard plans emphasized a shallow draft, twin-screw propulsion from General Motors or Paxman engines, and a boxy hull to maximize troop capacity while retaining seaworthiness for transoceanic convoy voyages between ports such as New York City and Scapa Flow. Naval architects incorporated lessons from amphibious operations like Gallipoli and studies by the United States Maritime Commission and the Admiralty to optimize ramps, ballast, and structural strength for repeated surf-zone exposures.

Variants and Modifications

Production spawned numerous subtypes, including troop-focused variants, gun-armed conversions, and specialized craft for reconnaissance, rocket support, and command roles. notable conversions created steam-turbine driven examples after consultation with Bethlehem Steel and diesel-powered types for the Royal Canadian Navy. Some LCIs were modified into mortar ships, equipped to provide close-in fire support during assaults modeled on lessons from the Invasion of Normandy and the Guadalcanal Campaign. Others became air-sea rescue platforms modeled on USS LCI(L)-713 style refits, while postwar modifications saw some hulls converted into minesweepers following doctrine from the United States Mine Warfare Branch.

Operational History

LCIs participated in major amphibious operations across the Mediterranean Theatre, the North Africa Campaign, the Sicily Campaign, the Normandy landings, and island campaigns in the Central Pacific. They were integral to raids and large-scale landings, working in flotillas coordinated by amphibious commanders influenced by doctrine from Admiral Ernest J. King and planners at Combined Chiefs of Staff. In the Pacific War, LCIs supported operations at Tarawa, Saipan, Iwo Jima, and Okinawa, often under threat from kamikaze attacks and shore batteries tied to the Imperial Japanese Navy. In the European theatre of World War II, they ferried assault waves during operations near Gold Beach, Sword Beach, and other sectors in the Normandy landings, surviving mines, coastal artillery, and Luftwaffe interdiction. Postwar, remaining units served in occupation duties and limited combat roles during the Korean War before many were scrapped, sold to commercial interests, or transferred to allied navies under programs managed by the United States Department of Defense.

Armament and Equipment

Standard fits varied but typically included multiple .50 caliber machine guns and 20 mm Oerlikon cannons supplied through U.S. ordnance procurement channels. Heavier conversions received 40 mm Bofors mounts, rocket launchers adapted from Forward Area Rocket Systems concepts, and mortars for direct fire support. Electronics suites advanced over the war, incorporating radar systems from General Electric and communication gear interoperable with Combined Operations Headquarters directives; navigation equipment often matched standards set by United States Coast Guard practice for shallow-draft vessels operating near reefs and shoals.

Crew and Accommodation

Typical crew complements ranged from a handful of officers to two dozen enlisted ratings, drawn from United States Naval Reserve units, Royal Navy volunteer reserves such as the Royal Naval Volunteer Reserve, and Canadian reserve personnel from the Royal Canadian Naval Volunteer Reserve. Berthing arrangements prioritized troop spaces over crew comfort: bunks and hammocks were arranged in open holds, with limited sanitation and galley facilities influenced by standards from United States Navy Bureau of Ships. Command and control during assaults relied on signalmen and junior officers trained in amphibious doctrine developed at schools like the Naval Amphibious Base Coronado and staff colleges in London.

Production and Shipyards

LCIs were mass-produced at American yards including Popham Davis Shipyard, Newport News Shipbuilding, and smaller Emergency Shipbuilding Program facilities authorized by the United States Maritime Commission. Subcontracting networks involved steel suppliers such as Bethlehem Steel and engine manufacturers like General Motors Corporation. The rapid production tempo mirrored other wartime efforts exemplified by the Liberty ship program, with hull prefabrication and assembly techniques influenced by industrial practices at Kaiser Shipyards and oversight from the Maritime Commission.

Category:Amphibious warfare vessels of the United States Navy Category:World War II amphibious warfare vessels of the United States