User blog comment:Tabby the Hedgehog/A question.../@comment-4451706-20121009154243

Start with Ace Combat Zero : The Belkan War ensued in 1995 Strangereal.

Then continue to Ace Combat 04 : Shattered Skies ensued in 2004 Strangereal.

And end it with Ace Combat 5 : The Unsung War ensued in 2010 Strangereal.

That way you will clearly understand Ace Combat world and thoroughly enjoy the game.

Good Luck! :)