This is a duplicate thread but since this one had a more robust query, I will respond here.
Where are you retiring from? It cannot be the Guard because you would have had this already handled. I doubt St. Louis will have your papers due to the fire that happened in the 70s. But here is a link.
http://invsoa.homestead.com/dd214.html
6. National Guard separation papers, NGB-22s, may be obtained through Stout
Field at Indianapolis.
[FONT='Times New Roman', Times, serif]
Indiana's County Veterans' Service
Officers advise that you not wait until you have an immediate need for your
DD-214. If you don't have a copy, contact your nearest County Veterans' Service
Office. Most offices can be found in the telephone book under County Government,
or you can find the details on your county's office by visiting the web site of
the Indiana Veterans' Service Officer's Association and click on the County
Service Officers link at[/FONT][FONT='Times New Roman', Times, serif][/FONT][FONT='Times New Roman', Times, serif]
http://invsoa.homestead.com[/FONT][FONT='Times New Roman', Times, serif]
.[/FONT]