I haven’t been on a military base/post in over 20 years. Do they still issue window decals for cars, or do they just check your ID?
The DoD stopped issuing decals about 10 years ago. Now they only use the ID card. If you have a 20 year old retired ID card you need to get a new one to get on base. I recommend checking with a nearby National Guard or Reserve armory about where you can get a new retired ID. My local Armory couldn’t do it and they referred me to the “big” armory that held several companies, ARNG & Army Reserve, and had the battalion HQ. I called ahead and made an appointment without a problem. And didn’t need to show my ID card to get inside.