Field hospital is also very useful since your tanks are generally attacking and therefore at greater risk of taking casualties. Arty company is always useful to give your tanks that slight extra bit of breakthrough and soft attack Anti Tank is less useful since very often your tanks have sufficient piercing to deal with other armor Maintenance is good overall especially since your tanks and trucks are expensive and keeping them from breaking down will reduce strain on your industry to replenish your tank divisions but it depends on how many armor divisions you want to have relative to how much armor you can produce. Signal Company can help you perform your battle plans better AA is a godsend if you don't have air superiority and/or your enemy uses lots of CAS Logistics if you're attacking in an area that requires it due to low supply in a region Engi is also good both for defense and against attacking certain zones. Recon gives you a speed boost which is great for armor, so include it. 10<20<40 width especially with support companies My recommendation 3 motorized for every 2 armor, either 10, 20, or 40 width. Assuming you're going for mobile warfare: