GI vs serviceperson

GI

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

  • A member of the U.S. military. 

verb
  • To clean aggressively. 

serviceperson

noun
  • A servicemember; a serviceman or servicewoman. 

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