The Marines are the smallest and scrappiest branch of the armed forces, as any veteran of the Corps will proudly (and loudly) tell you. But even among the Marines, there are still the few, the proud, the saddle-bound.
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.