A pity, they would have told us the regiment so I don't think we are going to be able to identify him.
The story with James seems to be similar to that of Joseph, no service record that can be positively identified as his. Again, a number of james Walker medal records, also unidentifiable. Frustrating I know but the odds are always against finding a Great war service record. Do you have any other family clues that might help?
MaxD