I’ve never been in the military, let alone been a Marine; though my father was. I am, however, the owner of an AK pattern weapon and even I know that there’s only one thing in the world that makes a ‘Tok-SHRACK-SHRACK’ noise. If you’re *not* at the range or a gun shop and you hear that noise, bad s**t is about to happen.
I’m not Marine, but that sound is fused into my nervous system and generates a visceral response which is a factor that I am still alive to this day.