I saw a program in England last year about the WWI vets. They interviewed a few of the last ones left. There qere two English and one French and I think they even interviewed an American Doe Boy. The origram was on the BBC 1 Network. They might know where to locate them as they have a large research department. If there any Yanks left alive and they never registered with the VA and have disabilities... wel hell,,, the VA probably owe them about a million dollars in back pay.