( This is Theory for Upcoming Ace Combat 7 games )
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In 2013 ( 3 years after Ace Combat 5 events ), president harling inform the public that the secret squadron , Called "Ragriz" by everyone, and all of their secret will release on 2020.
In 2020 ( Set as Ace Combat 7 timeline ) the Kingdom Of Erusea declare war on Osea Federation. The Document is likely postponed due war emergency.
I would like to see Ragriz secret would release around end of games.