The numbers are clear. Every defense stock in America now costs more than it's worth.How much should defense stocks cost? In 2017, I dived deep into this issue, concluding that on average and over a long span of time (17 years), U.S. defense stocks had historically sold for a valuation of almost exactly 1 times sales.I don't know about you, but 17 years seemed like a pretty hefty data set to me. Big enough, in fact, that when I saw most large defense stocks selling for closer to 1.6, 1.7, or even 1.8 times ...