The Great Santini
What does Varney know about Bull that few others know in the novel, The Great Santini?
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Varney knows Bull's real name, which is Wilbur. Varney insists on calling Bull by his given name rather than his preferred nickname, using it not only to annoy Bull but to remind Bull that he, Varney, is a full colonel and therefore higher in rank than Bull.
The Great Santini