When we were slacking through the area years ago we were driving along the service road on the other side of the ridge and encountered a bunch of Army vehicles parked in pulll out. They had grilles set up and told us that the games were scheduled that evening. We ran into a hiker the next day on the Benton McKaye trail and he mentioned that he had just set up camp the night before and there was small war going on for an hour or so that evening.
A other year we were hiking just sotuh of Swatera Gap in PA and while hiking along one particular ridge line we would see shadows and an couple of A10s would come roaring by a couple of seconds later just over the treetops and then a few second like that a very distinct brap of what I think were gattling guns. Very impressive.