The Illinois Department of Veterans Affairs keeps military records for many Illinois veterans and stores them permanently once they are located. If your records are not on file, an Illinois Veteran Service Office helps you request a certified copy from the National Personnel Records Center in St. Louis. They can also request duplicate military awards, get copies of service and medical treatment records, submit discharge upgrade requests, and request updates to your DD214. The department uses these records to confirm veterans preference for state employment, validate license plate requests, authenticate tax exemption certificates and furnish veteran burial certificates.
Contact your nearest Illinois Veteran Service Office and ask them to record and store your records or to request them on your behalf.
Whatever discharge paperwork you already have, and your identification.