The Monitor-class riverine assault boat was a class of American riverine patrol boat converted from a leftover stockpile of the Landing Craft Medium (6) (LCM(6) for short). The conversion was conceived at the height of American intervention during the Vietnam War to counter Viet Cong ambushes and mud bunkers along the river bank. Initially armed with a 40 mm Bofors autocannon as its main armament, six Monitors were converted to carry two M10-8 flamethrowers in mid-1967 to deal with more well-protected bunkers along the river bank. These Monitors were later nicknamed the "Zippo" after the lighter brand.

Introduced during Update "Fire and Ice" as a reward for Battle Pass: Season IX, "Smell of Victory", the Landing Craft Support (Flamethrower) Zippo or LCM(6) Zippo is the first naval vehicle in the game to be armed with a flamethrower, which is capable of instantly lighting up any ship on fire or even burning the water surface for a brief moment. However, these deadly weapons have very limited range and therefore the Zippo will usually have to rely on its 40mm Bofors and 20mm Oerlikon autocannons to deal with its targets. Being a converted landing craft, the Zippo has a very poor top speed and mobility, in addition to being unstable even in calm sea conditions. This means it is often left behind by its allies and unable to close the distance to the enemy.