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The Sup is a Rear Admiral.
Actually, the Superintendent is a Vice Admiral (3-star).
For example, if you have two candidates that are equally qualified in every category, but one grew up with one or more active duty military parents, then most likely that candidate would be selected over the other candidate without this experience.
This is also not true. Historically, a candidate with a family tie to the military (sibling, parent) might get a tiny bump in the admissions process. But is was tiny and I've never heard of a situation where that made the difference. With more information available to all candidates via the Internet, NASS, CVW, OpInfo, etc., I'm not sure a candidate with military ties gets any benefit today -- certainly not enough to make the difference. Plenty of legacy kids and kids of military parents are turned down, much to the dismay of their parents.