"Iowa, County Births, 1880-1935," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/VR86-SP8 : 20 May 2016), Alfred Leroy Knapp, 22 Nov 1927; citing Albia, Monroe, Iowa, United States; county district courts, Iowa; FHL microfilm 1,887,671.
"United States World War II Army Enlistment Records, 1938-1946," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/K8P2-5CL : 5 December 2014), Alfred L Knapp, enlisted 01 Feb 1946, Ft Snelling, Minnesota, United States; citing "Electronic Army Serial Number Merged File, ca. 1938-1946," database, The National Archives: Access to Archival Databases (AAD) (http://aad.archives.gov : National Archives and Records Administration, 2002); NARA NAID 126323, National Archives at College Park, Maryland.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/V9KP-SPN : 19 May 2014), Alfred Knapp, Jan 1980; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
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It may be possible to confirm family relationships with Alfred 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 Alfred: