Order of the British Empire | Ancient Rome | Arabic language | Order of Australia | Law & Order | Order of the Bath | Order of St Michael and St George | Dominican Order | Ancient Egypt | Ancient Greece | Royal Victorian Order | Ancient Greek | Law & Order: Special Victims Unit | Distinguished Service Order | Order of Canada | Order of the Garter | New Order | Order of Saint Benedict | Order of Friars Minor Capuchin | Order of the Crown of Italy | order | mystic | Independent Order of Odd Fellows | Arabic alphabet | Royal Guelphic Order | Law & Order: Criminal Intent | ancient Rome | Order of St. Olav | Order of St. Gregory the Great | Venerable Order of Saint John |
During his life, Caldwell was a member of the Newcomen Society, Freemasons, Shriners, Elks, and Knights of Pythias.