Going back some time now, but as one of those who frequently had to arrange the accommodation for both crew and pax, the options to use military accommodation overseas was always fully examined, but it was never cheap, the food was often either not suitable, or non-existent at the time we wanted it and one other relevant point, it's not free; the host nation always gets paid at their rates and the costs can be eye-watering for what were very basic facilities. When we did try it, the admin effort involved in taking over and handing back the facilities was phenomenal; the end result was almost always a hotel/motel.