Re: What were they doing?
that's near the land of Army superspooks, plenty of military ops going on (usually) a bit more covertly but it's a possibility.
plenty of training is conducted through urban and rural areas alike in areas like VA, NC and other places. They could have been cadre for the students/candidates conducting the training.
or who knows what, maybe DHS is doing some exercise.... crazy...
"Loud noises don't end gunfights.... well placed shots do."