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I have a hard time believing this.
Also, how much does a B-2 bomber cost?
I think you'll come to the conclusion that the price of a helmet (a cow) does not compare to the astronomical prices we pay for miltiary equipment today. A cow, while quite expensive because of intensive breed-perfection programs, just doesn't compare to the price of modern military equipment.
but I bet you could compare the price of a B-52 with the price of, let's say, a galleon.