GI vs paratrooper

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. 

paratrooper

noun
  • A type of soldier who is trained to enter combat zones by parachuting from aircraft. 

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