"Iowa, Armed Forces Grave Registrations, ca. 1835-1998," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q2QV-FB39 : 11 February 2019), Forrest Lee Defrance, Blank, 16 Jan 1975; citing Marshalltown, Marshall, Iowa, United States, The State Historical Society of Iowa, Des Moines.; FHL microfilm 2,169,523.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JL21-RZC : 10 January 2021), Forrest Defrance, Jan 1975; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).