I can break this down clearly, so you can better understand the things that I've said.
Number one: He was never under cover. From the moment the video started, he was standing up and shooting at the target, and not aiming down the sight (and you can clearly tell that he is not aiming down the sight). Now that right there tells me two things: either he knew where the target was, or he was just firing rounds pretty much for absolutely no reason. I know for a fact, regardless of training either army or Marine Corps, that we won't fire unless we know where the target lies. Now what I can see a reason why he was shooting without looking down the sights tells me that he knew the general location of where the target(s) were, and he laid some suppressive fire. It still doesn't makes sense to me why he stood there and moved maybe 50 yards and didn't think he wouldn't get shot at.
There isn't many variables in this. This video is clear as day, and I can get very deep into what he did wrong and what should have happened.
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We did not see him behind cover at he the beginning of the video, doesn't mean he wasn't prior and it doesn't mean he wasn't moving to cover when he took direct enemy fire. Again, we simply do not know. As far as "aiming" down the sight, I beg to differ. Watch as he fires he rifle from :08 to :21, he moves his head down to the sights on the 1st and 3rd volley. The 2nd volley I'm guessing he is watching for his rounds impacting to adjust fire. Just because the camera does not line up each time with the rifle the same way does not mean he does not have a "cheek weld" and is not using the sights, I've fired enough AR15 variants in enough rifle and carbine course to tell you that. Also, he was firing while kneeling, not standing. Watch the video again.
As far firing his rifle: "that we won't fire unless we know where the target lies", that certainly is not an accurate statement. If it is known that there is an enemy combatant at position A, and there is cover all around or near to their flanks, especially if those positions provide an avenue of approach for the enemy to close the gap, you had better believe there will be come suppression fire dealt in to those areas. In this situation, I'm guessing he could see the enemy muzzle flashes and were firing at that position until arty, air, or heavy weapons could lend a hand. Again, all speculation. It'd be very nice to have the author narrate this video, wouldn't it?
I'm not claiming to know the details of the fire fight, or to even say what this guy did was right or wrong, I'm trying to make sure those of you so quick to crucify this soldier are aware that you can not know all the details of the fight either. There are so many variables missing for any of us to blatantly judge. Only is immediate comrades and his superiors will know the actual events prior, during, and after this video. Some of you guys need to lay off the arm chair general BS.