[Clara Lou]

I don't think you need military training to do what this sniper has done. I listened to a former CIA/FBI/military-type say today that rifles of the type likely used by this sniper are so easy to use accurately that all it takes is some practice. All a sniper would need, it seems, is the appropriate rifle and perhaps a manual.

[Trust but Verify]

Well, there is a lot more to this person's skill than simply sqeezing off a shot on target. The ingress and egress of the area, concealment, etc, tells me this is a highly trained individual. And a good shot, to boot.

[Cuttnhorse]

You are correct about not needing military training for this. You can go to any shooting range in the US on a Saturday and see some pretty good shots from guys who never served in the military.