Join Call of Duty series at the beginning of World War 3. Designed as a direct sequel of Call of Duty: Modern Warfare 2, the game surely has a lot of inspiration from the previous while simultaneously introducing some novel aspects too. Instead of donning the role of a single character throughout the game, here there is an option of choosing any character at different periods of time to offer flexibility to the gameplay experience.
Move through this single player game by assuming a variety of characters thereby shifting the perspective as you progress. There are a triad of mission sets called Acts that you must accomplish. Every act contains several missions that aim to make the player perform several activities including just reaching a preordained checkpoint, take down enemies in a marked place or fending off air attacks from foes.
You might be asked to monitor small guns or sabotage enemy targets by planting mines or bombs. While you have a troop of soldiers, they receive no individual orders from you. Failure of some missions can also hamper game progress, so be alert and aware at all times!