What are you talking about?
The MOH:Underground score was completely new...and the song used in the Allied Assault trailer was from Underground...The Underground soundtrack was in fact better (IMO) than the 1st, so I suggest you check your sources again...
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"The Battle of France is over...the Battle of Britain is about to begin. Upon this battle depends our own British life, and the long continuity of our institutions and our Empire."
-Winston Churchill, Summer 1940