Isaac Murphy was a COG soldier who was born 29 B.E. and served in the COG military with the 26th Royal Tyran Infantry until the Battle of Aspho Fields, during which he was killed by an enemy APC. He did have a child, Levi Murphy, who is serving in the COG military. Isaac's wife died when Levi was two years old, so Isaac's mother raised Thomas during his childhood. He was a Sergeant when he was killed. Both he and his son served in the 7th Royal Tyran Infantry.