http://forums.bistudio.com/showthread.php?149661-RPG-Effectiveness

As it stands RPG/NLAW are instantaneous death to the armored vehicles.
Would like to see a system created to diversify effect on target. Not every strike should result in complete destruction of the vehicle.
I will quote a post from Maturin in the above linked Forum Thread.

"So what do we need? A penetration-based system that models angle of incidence, RHA equivalencies, ERA, KE vs HEAT. ACE has accomplished all this already. What they can't accomplish is varying wreck states for vehicles, with a middle ground between popped tires and smouldering ruin." - maturin 03/13/2013