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While Switzerland remained neutral during World War I, four of its citizens served in other nations' air forces and became flying aces.

References[]

Endnotes[]

  1. Above the Lines, p. 171.
  2. Above the Trenches, p. 228.
  3. Over the Front, p. 120.
  4. http://www.theaerodrome.com/aces/france/roques.php Retrieved 20 March 2011.
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The original article can be found at [[Wikipedia:List of World War I aces from Switzerland
|List of World War I aces from Switzerland]] and the edit history here.