A new and efficient projectile system is under construction for Modern Warfare. It will be able to detect unit, destructable and terrain collision. The projectiles system detects the height and size of the unit/destructable it hits, so let's say that there is a high destructable between yours and the enemy unit; Attacking the enemy will most likely make you hit the destructable instead, so you'd have to move your unit around, or level the destructable with the ground. If the destructable was low, you would shoot above it. Most of the projectile-based attacks/abilities will be using this new system.
If your unit is dodging a incoming missile, the missile will continue, and might hit a new unit behind the dodging unit. The video below shows a example of this missile evading effect.
