And this even included things as basic as ammunition for their guns,and fuel to run their trucks and tanks. The Dims in the US Congress are the ones that won the war from the North Vietnamese,not their counterparts in NVN.
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Neither the North or South had a large enough economy to produce armaments. What existed was an incursion from the north with communist supplied armaments which required outside supply of armaments to the south for resistance. Whichever side first fails to continue receiving outside support, loses. The Commies knew that and were ready to move when we began weakening our support for the south..