Veterans are defined as people who were members of the armed forces of the combatant nations during the conflict, although some states use other definitions.
On 27 June 2006, the British Government approved a National Memorial Service at Westminster Abbey, to take place after the death of the last known World War I veteran from the United Kingdom.
On 11 November 2009, despite the survival to that date of Claude Choules and Florence Green, the commemoration was held following the death of Harry Patch.
[39] On 21 November 2006, the House of Commons of Canada approved a state funeral for the last World War I veteran to have served in the Canadian forces,[40] but this was declined by John Babcock.
Listed here are those that joined the armed services after the Armistice date, but before the Treaty of Versailles was signed, or where there is debate on their join-date, or whose military service is sometimes viewed as outside the scope of "WWI", but are considered World War I-era veterans by the press or by their respective governments, or served in a related conflict.