Mission S4 is actually a 'flight test' to examine how the player has done thus far with maneuvering, flying and weapons-play. Unlike the obstacle course, I think this is a really cool idea (but, alas, it was not in Wing Commander Prophecy).
These updates are thanks to John "Captain Johnny" Guentzel, who provided several CD image archives of material used by the Wing Commander Prophecy development team!
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Date: May 2, 1997