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For several years, I worked for a company which made non-lethal weapons simulation gear, for military training. Stuff like replica grenades which send a weak radio signal upon 'exploding' - if the radio receiver in your vest gets the signal, you take simulated damage. Laser transmitters that sense the firing of a blank, wait a few milliseconds for the gunpowder cloud to clear, then send a laser encoded pulse where the bullet would have gone. That sort of stuff. It was very cool tech to work on. We built gear used to keep soldiers alive, and to train the men who disarmed mine fields. I told myself I was not in the business of war, I was in the business of keeping soldiers alive. Eventually, I didn't believe myself so much any more - I WAS in the business of war (albeit less evil than most), and I found other work.