Who

I always thought I understood how to use the pronoun "who" until I read this in a book: "Rawl was the Irish American son of a New Jersey truck driver who had enlisted in the United States Marines, made sergeant, and then...". I first assumed it was Rawl's father, the truck driver, who had enlisted in the United States and all, but then it became clear later in the book that it was Rawl who was the US Marine. I have read the sentence over and over again but still can't make sense of it. Please can someone help? 

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