It's the quiet moments on deployment when the sadness, and the loneliness you feel, comes rushing in, filling the silence. Holidays give you too much time to think about how much people you love are in each others' company, and you are not.
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.