Jeff White said:
"The fact is, there were plenty of COM hits on the gunmen. All ineffective because of the body armor they were wearing. Without a rifle or a round that had enough kinetic energy to knock the gunmen off their feet (which would also knock the shooter off his feet BTW) they weren't going to stop them, covered in kevlar with padding under it as the gunmen were."
Jeff, I agree with most of your statement, but with all due respect, some rifle rounds do carry enough kinetic energy to knock people off their feet - without knocking down the shooter.
A hunter who is leaning into a 30.06 does not get dumped onto his butt. But the deer and elk sometimes fall a$$ over tea kettle - even if it does get back up! I have seen it happen with my own eyes - especially if the target is caught in mid-stride when their balance is precarious.
Now some may say that getting knocked down in those instances has something to do with the bullet actually going through the vitals and that kind of shock makes it tough for the target to keep its feet. That may be a factor, but please see the attached video for a case in point of what can happen even if the armor is not penetrated.
http://www.youtube.com/watch?v=k_kv4p65q3s