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Yeah, you can use tungsten, if you want to double the defense budget. Tungsten is extremely expensive to mine and refine. Depleted uranium on the other hand, is dirt cheap. We had about 500 million pounds of the stuff laying around the last time anybody bothered to count. Its so abundant that the Defense Department gives the stuff away to munitions makers at no cost and then buys back the weapons at discount prices. Now that I think of it, doubling the defense budget might be a very conservative estimate.