Players that team up and join squads with each other may notice that one or more members could be showing "Incorrect Faction" above their character.
Squad members will all have to be the same faction before they can enter into matchmaking.
The leader (The player that created the squad) will have the option of choosing what faction the squad will be. If the leader picks Havoc, then the rest of the squad will also have to pick Havoc agents.
Changing your faction is easy. Simply click the "Agents" button from the main menu. Then select a new agent. The 4 agents on the left are Axiom, and the 4 agents on the right are Havoc.