. "1899-01-13"^^ . . . "Harold John Walkerdine"@en . "Harold Walkerdine"@en . "Lieutenant Harold John Walkerdine (13 January 1899\u201318 June 1966) was a World War I flying ace officially credited with seven aerial victories."@en . . . "Derby, Derbyshire, England"@en . . "Aviation"@en . . "Lieutenant"@en . . . . . "Derby, England"@en . . "1966-06-18"^^ . . "Lieutenant Harold John Walkerdine (13 January 1899\u201318 June 1966) was a World War I flying ace officially credited with seven aerial victories."@en . "Jackie"@en . .