I've been using Tricare standard since I retired in 94, fulltiming since 06. You might want to check some military healthcare websites before assuming you can be seen, even on a space "A" basis, for routine care. Personally I haven't been inside a military hospital since retiring although I did use a military pharmacy once.
I have stayed at a few famcamps and talked to other retirees. Seemed like a lot of trouble to be seen at the base hospital for other than emergency care. Some were grandfathered in, then kept coming back for annual appointments/test.