From experience only, the best location for DoD ID cards (Active Duty, Retiree, Dependents) is in Green Bay. They open their calendar at the beginning of the month and appointments fill up quickly. If you are bringing a dependent, be sure to schedule the same number of appointments as ID cards.
The online scheduler can be found at: https://idco.dmdc.osd.mil/idco/
If you select the "Locator," you can put in your ZIP code. You may have to expand the radius.
NOTE: The Green Bay RAPIDS site has closed permanently. No further information at this time.
Appleton does have a RAPIDS site at the 2-127th Infantry HQ; however, they are very difficult to reach for appointments. We have addressed this issue with Congressman Tony Weid's office. Please call (920) 832-2712. They MIGHT get back to you.
YOU are responsible for ensuring you have all your documentation they require.