Of Interest-the
WWI Picture-he is wearing a medical cadecceus with a "D"-possibly he was a Dentist or "Sanitary Detachment"-if you know family surnames and where this picture was taken write to the State Adjutant Office and inquire if WW I records match your family surnames

I see also you had a direct ancestor in the Civil War-possibly join the following?

http://www.duvcw.org/membership.html

http://www.suvcw.org/member.htm