yea in one portion there's a shadow of a helicopter with blades spinning, but then BAM - it stops. i couldn't help but snicker there a little bit, but the entirety of it is very ambitious. you're doing a good job so far, but i think if you want a test render to get opinions it's ok to render it out to 320X240 or even just do a quick playblast and save that to show.

i did notice that in one section (where the tank is coming out) the camera shakes quite a bit. i can understand if that happens because it's a huge heavy tank shaking the ground, but i don't think it would shake THAT much.

as far as the run cycle, i think it looks a little odd because they seem to kick their legs up pretty high - almost like a strut or something.