I didn't think about the GI Bill when I answered your first post. ... Use of GI Bill benefits may not result in an ID card being issued, but the VA Health Care System will issue an ID card if you avail yourself of any medical care, prescription services, or health benefits.
Your DD-214 will serve as proof of military service for any other reason.
Thanks. The only reason I wanted one is, so I could take advantage of discounts. I could have gotten one yesterday but I had no proof I served.