Here is the exact second that freeze-frame above is taken in the collateral murder video http://youtu.be/5rXPrfnU3G0?t=3m18s Compare with the picture that the US military claims is of an armed person http://mypetjawa.mu.nu/archives/savegunsmall.JPG

That person isn't carrying anything let along a weapon.

At the exact time the US troops say "that's a weapon" (around or just after 3:13) and thus fix the belief that the group is carrying weapons, from the Apache all that is visible in shot are 2 camera men, with cameras.

What amazes me is that who ever decided to make this picture didn't go to the effort to at least make a claim that wasn't provably false from the available evidence. It's really hard to prove a negative existential statement, so that would have been on their side.