TOEs and town supply:
basic town supply with inf, light atgs and trucks, a couple platoons worth of inf a few light atgs and 5 or so trucks, basically a garrison or rear guard.
Flags would be full flags units of different types: cav, heavy or light armours, Heavy inf, Light inf and Mountain.
Ability to form different flag units: ex- Cav Armour would be scout cars, fast light to medium (later tiers) and apcs, limited atgs.
Half Tiers Equipment: Equipment that is released between the tiers that are- too powerful for the base tier but not too powerful the next tier, a quick upgrade to existing equipment (example bolting a few plates of armour) or something rare or experimental.