Basic Details Surname Callaghan Forenames J Gender unknown Information stated on memorial War First World War (1914-1918) Served or died Died Primary Service As stated on memorial Sub-unit (Primary - Stated) HMS Vanguard Rank / Title (Primary - Stated) P O Our References Service (Primary - Our reference) Royal Navy Unit (Primary - Our reference) HMS Vanguard Rank / Title (Primary - Our reference) Petty Officer