The historical accuracy of armored vehicle classifications often sparks debate among military historians, particularly regarding the transition between World War I designs and those used in World War II. Many of the tanks frequently associated with early 20th-century combat, such as the British Mark IV "Male," the Mark A Whippet, and the joint Anglo-American Mark VIII "Liberty," are technically products of the Great War era rather than the 1939–1945 conflict. The Mark IV and Mark VIII utilized a rhomboidal track design intended to cross wide trenches and navigate the muddy craters of No Man's Land. Similarly, the French FCM 2C, a super-heavy breakthrough tank, was designed in 1917 and only saw limited, largely symbolic service during the fall of France in 1940 before being destroyed to prevent capture. These vehicles represent a "landship" philosophy characterized by heavy weight, multiple gun sponsons, and low speeds, which became largely obsolete as the principles of mobile, mechanized warfare evolved.
In contrast, the interwar period saw the development of vehicles like the Japanese Type 89 I-Go, which was the world's first mass-produced diesel-powered tank. Introduced in 1929, it served as the mainstay of the Imperial Japanese Army’s armored force during the 1930s and saw action in the Second Sino-Japanese War and the early stages of World War II. While it retained some older design elements, such as a relatively high profile and thin armor plating, it moved toward the modern turreted configuration that would define armored warfare. By the time the global conflict reached its peak in the mid-1940s, most of these early designs had been relegated to secondary roles, training, or static defense, as they were unable to compete with the high-velocity anti-tank guns and sloped armor of contemporary machines like the T-34 or the Panzer IV. The preservation of these early models today serves as a technical record of the rapid engineering evolution that took place over just a few decades of armored development.