���While the majority of rules in Call of Duty are almost identical to those in other d20 games. However, there are a few fields in which rules have been changed, adjusted, or added to. These are described below.

Modern Combat
���Combat is perhaps the area where the most changes have been made. With the advent of firearms and modern combat strategies, Combat has taken a turn away from hack and slash, and towards strategy. Check out this document to get the new maneuvers and abilities open to characters in Call of Duty.

Wounds & Damage
���To reflect the lethality of modern combat and the real world, a modified system is needed to handle damage in Call of Duty. Not only does this document detail thew new Vitality/Wound point system, it also gives information on optional rules for bleeding and stun damage. While mostly optional rules, it does have info essential to any campaign.