While the Default Operators are all pretty cool, you can unlock many of the others through gameplay challenges in Warzone, Black Ops Cold War and Modern Warfare, purchase them or their skins in the Store, or by unlocking tiers in the Battle Pass system. You begin your Warzone career as a Mil-Sim Operator there are two to choose from in Modern Warfare (shown above) for either side in Modern Warfare, who changes its appearance based on the Primary Weapon in your favorite loadout, in addition to the four Mil-Sim Operators from Black Ops Cold War: Huner and Song from NATO, and Powers and Vargas from the Warsaw Pact.