This new chapter in the Call of Duty franchise features a unique dynamic in which players are on the side of a crippled nation fighting not for freedom, or liberty, but simply for survival. 10 years after a devastating mass event, the nation's borders and the balance of global power have been permanently redrawn. As what's left of the nation's Special Operations forces, a surreptitious group known only as "Ghosts" leads the fight back against a newly emerged, technologically-superior global power. There are over 20 NEW Kill Streaks in Call of Duty: Ghosts — such as Juggernaut Maniac, Helo-Scout, Vulture and the ODIN Strike. You can even bring in Riley, from the single-player campaign, as your guard dog to warn you when enemies approach, and to attack enemies if they get too close to your person.

https://www.metacritic.com/game/xbox-one/call-of-duty-ghosts