How to unlock 5b,12b and 21b missions ?
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You need to play missions 3 & 4, 10 & 11 AND 19 & 20 (Joint Assault missions) online in order to unlock the required missions.
Optional: A Playstation Network account is required to play AC: Joint Assault online. If you don't have one, then register.
For more questions for Ace Combat: Joint Assault check out the question page where you can search or ask your own question.