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One of the main reasons to continue bayonet use is as a deterant (badspelling), It is a non-lethal way to scare a person/crowd away from your position

I've heard that, a display of a big knife, or even an M9 sidearm is like magic, one moment the individual is loud, then the next he starts acting right and being respectful. I guess they're not afraid of the M4, but that little 9mm scares the crap out of them.

"Teaching is not showing others new things, but reminding them that they know as well as you."

JYD #118