There's a video of a Marine officer receiving her first salute from her grandfather currently blowing up on Reddit, and, well, is someone cutting onions in here?
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.