dogface vs old soldier

dogface

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

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

  • An ugly person. 

old soldier

noun
  • A former soldier, or one who has served for a long time. 

  • Someone with a lot of experience in something; an old hand. 

  • The butt of a smoked cigar, or an empty bottle of liquor. 

  • A bottle whose contents are drunk at a single sitting. 

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