Cletus is a World War I Veteran serving in Company B 105 Engineers.
Sources
"United States, Veterans Administration Master Index, 1917-1940," database, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:Q5X5-68MM : 3 September 2021), Cletus Edward Geller, 26 Apr 1919; citing Military Service, NARA microfilm publication 76193916 (St. Louis: National Archives and Records Administration, 1985), various roll numbers.
U.S., Headstone Applications for Military Veterans, 1925-1963, Ancestry.com
Find A Grave, database and images (https://www.findagrave.com : accessed 12 January 2019), memorial page for Cletus E Geller (8 Jan 1896–17 Nov 1959), Find A Grave: Memorial #44192388, citing Lakeside Cemetery, Holly, Oakland County, Michigan, USA ; Maintained by Anonymous (contributor 46795196) .
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DNA Connections
It may be possible to confirm family relationships with Cletus by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Cletus: