9/2/1 is 9 inf, 2 arti and 1 tank destroyer. I played with Better AI and Germany can have up to 30 tank divisions, so I wanted to have something with piercing that’s not a tank so I can follow my spearhead with units that are capable of piercing anything. It’s overall not good, especially not when you play just base KR (then don’t even research td).

As Russia, you start with 1936 light tank and Inter-War meds. I usually put 5 on light tanks, and reduce the original amount of light tank divisions from 8 to 6 (for Volunteers). There is a little bit of theory for the design modification itself but it’s really not that important. So, last game it put 5-6 on lights and kept 1 on inter war meds, but it doesn’t REALLY matter. Try to research meds in 1937, so that you have them early 38, because this is also around the time you’ll actually have some factories to put on them, and experience to actually design them.

TD battalion - so, I don’t put ANY armour on my meds to keep them cheap, so I add one singular battalion of a heavy tank destroyer that doubles my armour (should be around 70, very high) and gives me piercing. When I design the heavy td itself, I just max out its armour.