At its core, Call of Duty: Modern Warfare 3's Passenger and No Russian have the same narrative purpose, with Makarov trying to use the attack to incite a war.

The Common Defense Pact faction is located in Russia, in Call of Duty: Black Ops III. In Call of Duty: Modern Warfare (2024), Russia appears in the Old Comrades mission, which set in St. Petersburg, where John Price and Kyle Garrick are hunting The Butcher.

The phrase "call of duty" is often used to refer to a sense of moral or legal obligation to fulfill one's responsibilities or obligations.

The Call of Duty series games are made in IW engine by Infinity Ward. You probably would've seen the name when you start any COD series game. Almost every game shows the game engine which it is built in. The IW game engine uses c++.