Series S is the designation these documents give to the Simulator missions. As you can see, they're a much more complex plan at this point, featuring a grand total of twenty-one missions patterned after the training missions used in the Star Wars space combat sims.
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!
Series S Overview
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Date: May 2, 1997