My only relative that was in WWI was a Great Uncle, brother of my Grandfather. I don't know much about him, but that he made it through the War and died of TB, Influenza, Pneumonia, or somesuch disease in about 1920. I did find his enlistment document on the Inet, (Ancestors.com) but not much more.
Of interest, his "occupation" was listed as "drug clerk". I guess he worked for Great Grandfather, a "Country Doctor", C.Z. Stidham. I have a great photo of C.Z. in a butchers apron standing over a cadaver taken at U.T.Memphis in 1890. I think they do better now in Med. school !!!

FWIW,

Emri