Go to the 20 second mark where he flashes the first bullet before dipping it into the Spam and you will see, quite clearly, that his ring finger and pinky finger are wrapped or braced together. If your 19 incher is still inadequate for you to see it then just watch the whole clip and note how he never grips with those fingers, how the don't move independently of one another, and how they barely move at all - certainly not in a 'natural' range of motion.
Still doesn't mean that this is a real video from a real Cavalry trooper actually serving in a war zone. Someone on another site said that the hat isn't issue gear; that it appeared to him to be a civilian design from one of the pseudo-military gear catalog houses.
I do hope it can be proven a fake; I actually approve of the basic sentiment and would love to see it carried much further officially. But given the politically correct ROE, this video, (real or not), IS going to cause political problems, and if the DoD brass track it down to a specific soldier, he is going to regret it.