In the Ace Combat games, there are a number of references to past games in the series. |-|Ace Combat 2= * Scarface Squadron from Ace Combat 2 also appeared in Air Combat. Scarface 1 was the playable character from Air Combat, making him the first Ace Combat protagonist to appear in more than one game. |-|Ace Combat 04= * John Harvard appears as an Erusian pilot flying over Stonehenge.[citation needed] * Megalith is destroyed almost exactly the same way as Fortress Intolerance from Ace Combat 2. |-|Ace Combat 5= |-|Ace Combat Zero= |-|Ace Combat X=