OK, so if I would take Germany:
1) Start development of 7.5 cm / L70 immediately, as well as conversion of 8.8 cm Flak to a PaK - to be used as a basis for both towed and vehicle anti-tank gun
2) Reduce the number of types armoured vehicles:
- Scouting car: Kfz.14 or Sd.Kfz.231
- Light tank...