Right now in the SR series, the supplies are distributed through the system by default and are now available too easily. Although it is likely to adequately represent the potential supply today, the Cold War, water supply systems in the area are much weaker and more fragile. Perhaps only a large reduction in the amount of supplies that system can deliver to a hexagon will suffice. And a situation of Berlin Airlift even possible? Units should be able to supply the cities and towns how to cut off the supply would have to be changed.
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