Call of Duty: Ghosts adds a lot of new stuff to the game – well, by Call of Duty standards at least. New gamemodes, perk system, attachments and so on. They've also added a new way of unlocking them too. Typically, in a Call of Duty title, rank and XP determine what you unlock. When it came to weapon attachments, using that weapon in particular would unlock more parts for it. In Call of Duty: Ghosts that's all there but there is also another method, Squad points.