The difficulty goes up with every group and there’s a big diversity in them.
you’re free to complete nearly all mission alone, without the help of a second player.
Two missions can be completedONLYwith the help on another player.
Those missions are: Overwatch (Bravo) and Big Brother (Bravo).
However if you do decide to play in co-op, be sure to use voice communication.
It’s really useful in many cases.
you might still shoot while on the ground with a pistol.
The stars will let you unlock more mission groups and achievements.
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