According to this page: https://reg.msu.edu/ROInfo/FAQRO.aspx#InState, the answer is YES.
A: If the student, the spouse of a student, or a parent of a dependent student:
is serving on active duty in the United States Uniformed Services;
is serving in the guard or reserves in one of the reserve components; or
has received an honorable discharge from one of those Services or reserve components.
Has anyone’s out of state student applied for and received in-state tuition at MSU if their parent served on active duty before the year 2000 and was honorably discharged?