Incredible story!
That Marine had alot more presence of mind in that situation than I ever would have had. I don't care if there was a "little kid" firing an AK47 at me, I would have taken him out the first time! Reminds me of the scenes in Saving Private Ryan: if you let the a$$hole live, you give him another chance to take YOU out later. This is war and you need to take people out if they give you any hint of aggressive behavior.
I feel bad for all the people and soldiers that were sent on that unprotected mission.