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Here's his WWI Draft Registration: Source: "United States World War I Draft Registration Cards, 1917-1918," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K6F6-TR1 : 12 December 2014), John William Duncan, 1917-1918; citing Columbiana County no 1, Ohio, United States, NARA microfilm publication M1509 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,832,015.
Image at: https://familysearch.org/ark:/61903/3:1:33SQ-G1DH-QGG
Name John William Duncan Male
Draft Registration September 12, 1918 Columbiana County no 1, Ohio, United States
Birth Date 25 Jun 1877 Birthplace, United States
Nearest relative: Margaret E. Duncan
Source: "United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MZ1P-72X : 14 July 2016), J M J L Duncan in household of J N Duncan, Wayne, Columbiana, Ohio, United States; citing enumeration district ED 62, sheet 702A, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 1002; FHL microfilm 1,255,002.
United States Census, 1880 Wayne, Columbiana, Ohio
J N Duncan Self M 27 Pennsylvania
Mary E Duncan Wife F 29 Ohio
J M J L Duncan Son M 3 Ohio
Thomas L Duncan Son M 0 Ohio
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