By now everyone has seen the video.  Here are some physical facts that one should consider.  These facts do not support the position of the military and many apologist. 



It is said by apologist that these crewmen on the AH-64's were looking at and over a "hotbed of insurgency". A place where insurgents and danger lurked around every corner and were on edge.  I don't disagree that in their minds it could have been just that.  However some figures evident from the video 

If the place they were over was such a hotbed for insurgents why were they so unconcerned for the people directly below them who could have had the range with their weapons (say RPG's and AK's) to hit them? It is said that the Heilo's were 2 km away. (They did not have a clear view. etc.) That means they were circling on a roughly 12km circle. They would need to be going 6 km per minute or or about 376 km/hr to get around that circle in the time it takes for them to complete one orbit.   The time it takes for them to "swing around".    The published top speed (going in a straight line) of the AH-64 is only 305 km/hr. The helicopter had to have been much closer. 1.6 km maximum by my calculations.  That is if they were on a circle which is the shortest path and they likely were not.  This means that if anything they were closer than 1.6km.  However that speed for the AH-64 and the time elapsed means they were still at least a km off. 

The effective range on an RPG 29, the weapon they say they saw pointed at them is 500m.  They were out of the range where that person could have hit them. 

While at the same time a 1km diameter circular area within this "hot zone", should have seemed full of insurgents who were well within range to hit and kill them with their RPG's. I know there was an other AH-64 around but it wasn't covering them, both were focused on the same target. 

So as these men were shooting a van which to all intents looked like it was full of unarmed civs they could have been exposing themselves by the way of their noise, and muzzle flash to actual threats below them, and within range. That is not the behavior of soldiers who are on edge and genuinely fearful for their life and limb.

I have had other things to say on this... but they aren't scientific.  Let me just say my personal opinion is that the first instance is probably a honest mistake.  I have relatives in the military, I have heard their stories and stuff happens in war that you have to have been there to fully appreciate.  However firing on the van latter in the video is really something that needs to be brought to trial in a neutral tribunal.  There is just no way to excuse that one.   What I have above this paragraph is Mathematics, facts.  There isn't a liberal and conservative value of pi. (Oh and I'm not really a liberal either so I don't want to hear that mess.)