Thats not what I meant. I said it is impossible to add new units to RA1. I know there is mods around that have new units, but they have replaced the old ones. Also you can make infantry out of civilians but the infantry will not lay down when attacked, and will run around like civilians. The same apples to vehicle's. If you replace a convoy truck with a heavy tank, it wont be able to turn its turret and will behave like a convoy truck, If you can hardcode you can add new units.