As you round the corner, gracefully pieing the cavernous doorways of an abandoned installation with your M249 squad automatic weapon, you hear a squadmate hiss: “Something is coming!”
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.