There’s a common saying in the Corps: “Nothing is Marine-proof.” A determined lance corporal with enough time on his hands and limited supervision could find a way to break a ball bearing. Which makes Marines the perfect testers for new “rugged” gear, and explains why the Marine Corps seems so confident that it’s new pack frame is built to last — at least, until Marines get bored, and their SNCO walks away for a smoke break.
Benjamin Franklin nailed it when he said, "Fatigue is the best pillow." True story, Benny. There's nothing like pushing your body so far past exhaustion that you'd willingly, even longingly, take a nap on a concrete slab.