Effects BMP-1 and BMP-2.
As title, additionally the players weapon is invisible.
Weapon becomes visible when ADS, and the the outside of the BMP also becomes visible.
Camera position is in the wrong place unless aiming down the sights.
Additionally the ability to look around/aim is significantly different between weapon down (Ctrlx2), weapon up, and ADS, with ADS having the least ability to aim/look around.