My great grandfather was born March, 11, 1894 probably in Breathitt County, Kentucky, died in 1973 he served in WWI. I found this Enlistment Date: 24 Apr 1918 Release Date: 29 Nov 1920 but nothing more was ever found about his service. I have a photo of him in his uniform. Would love to find more about his time in service. This is his draft registration card: View attachment 20835 http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GSln=marshall&GSfn=adam&GSbyrel=all&GSdyrel=all&GSst=19&GScntry=4&GSob=n&GRid=10923291&df=all&
This is a bit out of our wheelhouse, being a WW2 Forum. However, have you tried requesting his WWI records from the National Archives?