Dude, it's the military. If the worst you get while serving is a raw deal from the political bullsnot and a few loud insults thrown your way, consider yourself lucky. Some who survive combat come back without arms or legs - if they survive at all.
Complainers are trouble. They demoralize the unit and distract the leadership from doing their jobs. It's best to weed them out early in boot camp, rather than send them out to the field where they're likely to do nothing but whine and complain about the noise, the dirt, the smell, and the bullets flying their way - if they don't desert first, and leave a hole in the line from where their comrades were expecting cover fire and combat support.
Send them home to their mommies, and let the real soldiers have a better chance of surviving and winning the war.
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