Apropos of nothing, and it's just my guess, our Forever Wars have created a vast amount of veterans with combat experience. It seems like a lot of them return to the US and parlay the training provided by Uncle Sugar to start security & firearms training companies. So they're just kind of teaching what they were taught, much of which doesn't have a lot of applications in civilian life.
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“I'd rather have questions that cannot be answered than answers that can't be questioned.” —Richard Feynman