Dunno who's training over the hill behind my house today, but they have an interesting variety of hardware. Some real large caliber stuff in addition to the usual 5.56mm and grenades. Probably at least one M14/SCAR-H and, judging by the rate of fire, an M60.
edit: And now something with a higher ROF, maybe a SAW. Just as long as they keep their stuff on their side of the hill...