I have a question about the Advanced Airbase, I am at level 8 and am purchasing a ton of the Stealth Bomber's they help out great, but what I am curious about is what happens when you upgrade Advanced Airbase beyond level 8 do you get some hidden units by upgrading the Advanced Airbase to level 9 then level 10, does anyone know what happens by doing so, or is it just pointless to advance any further after level 8 on the Advances Airbase?
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