Once again, Activision finds itself in a middle of a lawsuit, and again, it's because of Call of Duty. NovaLogic, the developer of the Delta Force franchise, is seeking damages and an injunction for trademark infringement against Activision for the use of the Delta Force trademark in Modern Warfare 3. The Delta Force name was used in Modern Warfare 3, but is owned by NovaLogic.
The complaint also points out the similar logos from the Delta Force symbol used in Modern Warfare 3(left) and the symbol used in the Delta Force games(right):
Not only is Activision a part of the complaint filed by NovaLogic, but so is Turtle Beach, Microsoft, and BradyGames who all used the logo without permission as they were licensed to these companies by Activision. NovaLogic states that they've lost millions due to this infringement hence the reason for the lawsuit.