FWIW, if the military family moves after they graduate, the child will typically be now a resident of wherever their parent moved to at that point. Yes, they can have a driver's license in an another state, but that does not make them a resident of the state. If the parent can declare them as a dependent on their taxes than the state the folks submit on their taxes is the state they are considered a resident.
~ DS started college in MD after we retired to VA (3 weeks after retirement). He held an NC DL and could vote in NC. As a student they did not make him change his DL or voter registration, but as far as his college was concerned, he was a resident of VA since we claimed him as a dependent.
There is a caveat for military kids that I know of regarding IS residency for college, not for MOC noms. If a parent moves to another state as an AD member, and the child is in college or recently graduated like yours, than the state will consider them IS while attending the college. They see it as the military forced you to move and will not hold it against the child. However, again that is for tuition purposes and not every state does that, most do though. It is not for MoC noms.
~ Had our DS attended UNC and we were living in VA, even as a retiree, he would have been considered IS for his entire collegiate career, since he was accepted when we were living in NC (owned a home, and as a spouse of an AF officer I had to get an NC DL). They saw it as, we won't hurt the kid because of the folks moving due to the military regulations.