The M44 155 mm SPH was an American-designed self-propelled howitzer (SPH) developed during the Korean War to replace aging World War II-era artillery. Built on a reversed M41 Walker Bulldog chassis and transmission, production of the M44 was standardized by 1954, missing the Korean War. With surplus units in peacetime, the M44 was distributed to allied nations, including Japan. As the Japanese Ground Self-Defense Force (JGSDF) was in its early stages and domestic vehicle development proved costly and challenging, the US offer of 10 M44A1s and several M52A1s was accepted. These units served under the JGSDF's 7th Artillery Regiment until 1986, when they were phased out by the Type 75 SPH.

Introduced in Update "Storm Warning", the M44 SPH is a highly mobile and lightly armored self-propelled casemate artillery vehicle. Equipped with a 155 mm cannon, it fires M107 HE—a powerful shell that later becomes a NATO standard and common across higher tiers and various nations. However, its short barrel significantly reduces shell velocity and increases drop, requiring careful aim. Defensively, the M44 offers minimal armor protection and features an open-top casemate with limited horizontal traverse, leaving its six-man crew exposed. Despite this, the high crew count provides some survivability, and its .50 caliber machine gun adds limited utility against aircraft and lightly armored vehicles.