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"Has anyone ever used them?"
Yes. As already noted, they are useful training aids which help illustrate holes in training, tactics, and beliefs about performance in ways that talking about it cannot do.
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Meriam Webster's: Main Entry: ci·vil·ian Pronunciation: \sə-ˈvil-yən also -ˈvi-yən\, Function: noun, Date: 14th century, 1: a specialist in Roman or modern civil law, 2 a: one not on active duty in the armed services or not on a police or firefighting force b: outsider 1, — civilian adjective
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