You can have a "Veteran" designation printed on your South Carolina driver license, beginner permit or ID card as proof of military service. There is no fee for adding it.
Visit any South Carolina Department of Motor Vehicles office and ask for the Veteran designation. Bring one of the accepted proof documents with you.
One of the following: a DD214 showing an honorable or general under honorable conditions discharge, an NGB Form 22 showing that discharge plus at least 20 years of qualifying reserve component service, a 20 year letter of eligibility for retired pay from a reserve component, or a Veteran ID Card issued by the VA.