Seeking info about great uncle who was never heard of after being drafted to WWI

His name was Christ G Karamzalis (possibly Christos or Christopher, and middle name is likely George which I believe was his father's name).

Born in Greece (sometimes listed as Macedonia/Turkey) 

DOB: Dec 15 1884

He was living in Yellowstone Montana when he was drafted to WWI. I have a copy of the draft record from

He wasn't heard from again.