I'm playing a new game as the Soviets and want some heavy tanks mixed in among the waves of infantry. Armored divisions usually rely on tanks, some heavy infantry in armored transport and self-propelled howitzer & anti-tank guns. Proper tank usage is to fill your entire combat width for any given battle completely with tanks. Historically the terms used in Hearts of Iron 4 had very different meanings for most of the countries.
You can go for either light,medium or heavy tanks. I'm thinking 4 tanks and maybe two infantry. Armies are composed of divisions, which is the smallest unit a player can directly control. Using medium tanks is best combination of cost, speed, and combat ability.
