HI PATRICK, I hope this information may help, but it also may not be the person you are seeking:
Social Security Death Index (known as SSDI)
Jack A. Claywell b. 25 Sep 1920 (you had written 1923) d. 1 Dec 1989Mooresville, Iredell, NC
Mooresville is just north of Charlotte, NC and a "bedroom" community for some people who work in Charlotte,NC
An obituary search in Iredell County Library might turn up info on this Jack A. Claywell....with more information. Or a newspaper obituary, or a funeral home in that area might have "handled" the funeral. Mooresville is very small.
Horace R. Claywell b. @ 1901Res 1930Honolulu, Hawaii Res 1920 Lake County, IL death 1951 listed as: US Veteran Gravesite - Cemetery Site:MO
his obituary should state the names of children and perhaps Jackie Albert Claywell will be listed.
Almost any VA person in MO will be able to tell you where the veterans cemeteries are in MO.
Usually an obituary will say:son, so and so, living so and so - but no always. However, it may give other info that will help you. ..like where he recently had lived or served.
The info did not give which branch of the service. use google to find VETERANS CEMETERIES - there is a listing by state with information about each one in MO.