His WW I describes him as tall, of medium build with brown eyes and hair, in the Student Officers Training Corps at Ft. Riley, Kansas.
Sources
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MMTR-SJV : accessed 26 March 2016), Harden Mitchell in household of John A Mitchell, st st Highland Township, Jewell, Kansas, United States; citing sheet 5A, family 102, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,240,484.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M2CX-322 : accessed 26 March 2016), Arden H Mitchell in household of John A Mitchell, Highland, Jewell, Kansas, United States; citing enumeration district (ED) ED 64, sheet 13A, NARA microfilm publication T624 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,374,455.
"United States World War I Draft Registration Cards, 1917-1918," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K66D-WQQ : accessed 26 March 2016), Arden Harper Mitchell, 1917-1918; citing Jewell County, Kansas, United States, NARA microfilm publication M1509 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,643,522.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MF6F-1KC : accessed 20 March 2016), Arden H Mitchell in household of William R Mitchell, Mankato, Jewell, Kansas, United States; citing sheet 11B, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,820,535.
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DNA Connections
It may be possible to confirm family relationships with Arden 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 Arden: