Listed here are those whose service is considered outside the scope of World War I , but who thought during the era . Listed here are those whose service is considered outside the scope of World War I. Reasons for this could be that they joined the armed services after the Armistice date , but before the Treaty of Versailles ; or where there is debate on their join-date ; or whose military service is sometimes viewed as outside the scope of World War I , but are considered World War I-era veterans by the press or by their respective governments ; or who served in a related conflict .