Basic Details Surname Crosthwaite Forenames J Alan Gender Male Information stated on memorial War First World War (1914-1918) Served or died Served Notes The memorial states he enlisted in 1917. Primary Service As stated on memorial Service (Primary - Stated) Navy Unit (Primary - Stated) RNVR Rank / Title (Primary - Stated) AB Our References Service (Primary - Our reference) Royal Navy Unit (Primary - Our reference) Royal Naval Volunteer Reserve Rank / Title (Primary - Our reference) Able Seaman