To help with the departure from a linear campaign are a set of special missions dubbed Strike Force in COD: Ghosts. The classic three-tiered Call of Duty perk system has been done away with, replaced by seven categories of five perks. The perks in the game can be unlocked with Squad Points that you earn by playing the game. Almost all of the call of duty ghosts perks and weapons are completely new thanks to the next-gen engine.

In Call of Duty: Ghosts, for the first time, the player will be able to alter their experience on each map using weapons and launchers. Many of the explosive weaponry can be used to destroy walls and cause events that can benifit your team. Each player chooses 2 ghosts weapons and their own level and items are available to their soldiers, so they can shape soldiers as you see fit to excel during different game modes.

Call of Duty: Ghosts offers players the ability to transfer their progress from an Xbox 360 to an Xbox One or a PlayStation 3 to a PS4. Squads is a single-player/co-operative/competitive facet in Ghosts - you use the ghosts create-a-soldier system and prestige in Squad vs. Squad battle, pitting you and your squad against someone else. The traditional level-up system is gone and has instead been replaced by Squad Points.

Source: COD Ghosts