dogface vs infantryman

dogface

noun
  • A foot soldier, especially during World War II. 

  • Either of two pierid butterflies of the New World genus Zerene. 

  • An ugly person. 

infantryman

noun
  • a soldier employed in an infantry role 

  • a male soldier of the infantry 

How often have the words dogface and infantryman occurred in a corpus of books? (source: Google Ngram Viewer )