http://www.youtube.com/watch?v=Kz37Yc88nh4
To me it's the best soundtreack I heard in a game so far. It's epic and it fits the theme of the game very well. Also if you're wondering why I also linked Cardboard Warfare 2 it's because it uses it and it has it set up the same way like the game.
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The Beginning of The End mission had the best OST at the start.