I have ideas for unique units for the people who only have an infantry and tanks.
Greece
Metaxas Fortification 70 Cannot move Cannot attack -30% vs tanks
Riflemen 34 -20% vs tanks +20% on defense
England
Home Guard 30 Cannot embark Interception (50) (SPECIAL_FORCES)
+10% vs gunpowder
France
Maginot Fortification 70 (same as metaxas)
Germany
Panzerfaust 36 +50% vs Armour -10% vs gunpowder (INFANTRY)
King Tiger/Panzer VIB 120 (should be strongest) (SUPER_HEAVY_TANK)
Greece
Metaxas Fortification 70 Cannot move Cannot attack -30% vs tanks
Riflemen 34 -20% vs tanks +20% on defense
England
Home Guard 30 Cannot embark Interception (50) (SPECIAL_FORCES)
+10% vs gunpowder
France
Maginot Fortification 70 (same as metaxas)
Germany
Panzerfaust 36 +50% vs Armour -10% vs gunpowder (INFANTRY)
King Tiger/Panzer VIB 120 (should be strongest) (SUPER_HEAVY_TANK)