MMA35,
Exchange and commissary fine, not USAF quality though <bg>.
Marina is late spring through fall. Closed in winter. Lots of retirees pass through the facilities.
Here is a link to help out. https://www.cnic.navy.mil/GreatLakes...tion/index.htm
I drilled there for a bit. Did you go to Marmion then? Grew up on the Fox River north of you.