"United States, Veterans Administration Master Index, 1917-1940," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q5PT-JNPZ : 25 October 2019), Leo ? Caulkins, 27 Jun 1919; citing Military Service, NARA microfilm publication 76193916 (St. Louis: National Archives and Records Administration, 1985), various roll numbers.
Find a Grave, database and images (https://www.findagrave.com : accessed 19 August 2020), memorial page for Leo E. Caulkins (23 Aug 1889–16 Dec 1967), Find a Grave Memorial no. 42347734, citing Liberty Cemetery, Liberty, Montgomery County, Kansas, USA ; Maintained by fpw (contributor 47044704) .
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DNA Connections
It may be possible to confirm family relationships with Leo by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: