I have a copy of my grandfather's WWI draft registration card dated June 5 1917. He had been deaf since the age of 2 and the registrar wrote "deaf mute" in answer to the question regarding disability. Following that is a stamped code of 34-5-12 A. In answer to a similar query, a responder indicated that it wasn't a code for the disability. I'm wondering what it is a code for. Thank you.