I've been on the AT near Stover Creek before when they were training with choppers, but this time they began with a loud boom and then machine gun fire. Lots of machine gun fire. I didn't know blanks would cycle an M4. Anyhoo, man they were loud.
There would be silence for a while, just enough time to get back to sleep, and then Boom! Brrrrre! Bang bang!

I guess they are sharpening up for Syria or God forbid Ukraine?