I've noticed a few things that could be adjusted. The travel lock for the gun tube (on the back engine deck) is normally pointed rearward. I think you have yours pointing forward towards the turret.
Secondly, your left hand smoke grenade launcher appears to be mounted askew. The top row of holes should be parallel to the ground.
Third, the support rollers for the M48/60/88 series vehicles are rubber rimmed.

Lastly, it appears to be a Marine Corps version. You should remove the ERA and paint it in Army colors.
