Who did the Sharpshooter become and what did he do after he recuperated?

After the Sharpshooter recuperated, he was taken to the main ward. He began to sit with other soldiers and read to them from the Bible. He became an orderly and was paid to work long hours helping the wounded. The elderly surgeon who treated him lent him his own last name, and the Sharpshooter took the name John O'Shea, because he had amnesia. The Sharpshooter lived in the basement of the home where the doctor and his wife lived and walked to work daily.