It would be interesting to know if he was overloaded and/or had a CG problem (possibly a load shift? or mis-loaded?).
Whatever it was, he stalled bigtime. When the plane first comes into view it appears awefully nose-high (but the camera angle is difficult). Also note puffs of smoke coming from both inboard engines just after it comes into view (possible double compressor stall? if so, at a very bad time. black boxes would show that up later.)
There's also a waft of "smoke" from the right wing tip visible. Possibly fuel venting? or vapor trail off of wingtip due to high AOA?
Interesting that he never gets his gear up. Might have begun to see problems even during the takeoff roll or shorly after liftoff. Normally, if he thought he could still make a go of it, he would get the gear up quickly. He might have had his hands full right from the start.
Might add, not knowing what it was carrying (this being a war-zone) and the fact that it goes down near a POL staging area, the driver likes to live dangerously.
Thanks for posting, Stonewall.