Call of Duty has long been one of the biggest and most popular video game franchises on the planet, and it's fair to say that, despite being a part of the oversaturated FPS genre, it's succeeded in creating a very distinct identity for itself. While each Call of Duty entry will switch up the weapons, gimmicks, and setting to present fans with a fresh new experience, players can still always expect at least a few of the series' long-running traditions to show up in one form or another.