In World War II, the US military was more scientific in the preparation of armored divisions. Armored divisions had better mix tanks, mechanized infantry and support weapons. For example, an armored division has two armored regiments, a mechanized infantry regiment, an armored artillery regiment and its logistics support unit. The armored regiment is preferably composed of two tank battalions and one mechanized infantry battalion, which is composed of one tank battalion and two mechanized infantry battalions. Such an armored division can have five tank battalions plus four mechanized infantry battalions as the main battle force. Of course, the armored forces of various countries in World War II are still in the preliminary experimental stage, and how to match armored forces with infantry forces is still in the discussion period, so it is impossible to be perfect at the division level, and it is very reasonable to configure them at the battle group level (brigade level or regiment level).