Remember... there are no safe Rear areas anymore. Once you are "out of the Wire" you are in "indian country".
Clerks, cooks, mechanics and truckers must know the business end of the service rifle AND use the equipment combat arms soldiers have used... body armour, helmets, MGs, NVGs, etc.
I always thought those admin DPs were a bit ridiculous and unrealistic in today's combat environment. Glad that lessons learnt is making it's way down to the new guys.