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There's a section of Gustav Hasford's 'The Short Timers' that describes this well. Two soldiers have recently returned from the front lines and hitch a lift to a base, or PX, or something of that nature. The gate guard - some fat fuck who's clearly never seen the enemy face to face - won't let them in because they're Marines and Marine day is Tuesday, or something of that nature, so our man just cocks his rifle and sticks it in the guy's stomach, finger on the trigger, and looks the guy in the eye.

It's a very well written book.

I don't know really whether I should recommend war stories to a guy who's been to war but if you do enjoy reading that sort of stuff, both of his novels (The Short Timers - which turned into Full Metal Jacket - and the sequel 'The Phantom Blooper' are excellent.)