GI vs troopie

GI

noun

  • A member of the U.S. military. 

  • One who is demanding and strict, in the manner of a stereotypical member of the military. 

verb

  • To clean aggressively. 

troopie

noun

  • A trooper; a private. 

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