Ghosts’ third mode called ‘Squads’ features 4 player co-op modes, solo modes, and more

Infinity Ward has replaced Spec Ops with a brand new Squads mode for the third game mode. Playing Squads impacts MP; it helps you earn XP, unlocks and more.

In Squads, there are several game modes available to play:

• Squad Assault – Play in an epic 6 player co-op match against an offline squad
  
• Safe Guard – 4 player Co-Op mode inspired by Survival from MW3. It’s wave based.
  
• Safe Guard Infinite
  
• Squad vs. Squad – compete against others, 1v1 with your Squad as team mates
  
• War Game – You hand pick 5 Squad mates to play against a prestigious AI control team
  

Source - CharlieIntel