Landing craft mechanized

[1][clarification needed] The LCM Mark I was used during the Allied landings in Norway (one alongside the MLCs),[2] and at Dieppe and some 600 were built.

There were two designs: Capable of carrying 120,000 lb (54,000 kg) of cargo In appearance very similar to the LCVP which Higgins Industries also constructed, with a 10-foot (3.0 m) wide load area at the front and a small armoured (1/4 inch steel) wheelhouse on the aft decking over the engine room.

[5] Another Higgins LCM-3 is displayed at the Museo Storico Piana delle Orme in Province of Latina, Italy, 18 miles east of Anzio.

Some were modified as armored troop carriers (ATCs or "Tangos"), others became "monitors" with 105 mm guns, "Zippos" with flamethrowers or "Charlie" command variants.

A few LCMs were converted to lay and repair hoses for tankers equipped with the offshore petroleum discharge system (OPDS).