Once upon a time, in a faraway desert, I carried way too much weight for way too many days. I also got blown up, tossed about, and experienced all the joys a good combat deployment has to offer.
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.
And no one knows that better than military service members and we have the pictures to prove it.