I'd give credit on the student work for a 3d like that, well, for the effort until now, but of course as all of the other senior mentioned,

it's basically all coming back to the 'liveliness' of the thing, of course, its not an easy thing to change but its good to take note on

the audio itself, which probably 80% of the time took up was from the rendering,modelling itself which probably also leaves no much time for detail on the audio?
yeah, a lot of reference from wargames if you look at how tank and soldiers in pain moves would does help though.
on the other side, there are parts that i actually like how you potray the scene and angle, just probably the finishing doesn't really lives up with it.

my2cent

rockon