No idea where this idea of massive munitions stockpiles comes from. The whole point of converting industrial capacity during wartime is to boost military production. Stockpile raw materials (which is of course happening already), instead of finished products, because raw materials can be used for any product. Keeping modest munitions stockpiles with lots of capacity is far better than the other way around. That's how you end up with huge amounts of waste, fraud, and obsolete gear.