gonfalon vs lieutenant junior grade

gonfalon

noun
  • A standard or ensign, consisting of a pole with a crosspiece from which a banner is suspended, especially as used in church processions, but also for civic and military display. 

lieutenant junior grade

noun
  • A commissioned officer of the United States Navy whose rank is above an ensign's and below a lieutenant, or a corresponding rank in other navies. 

  • A commissioned officer in the United States Coast Guard, Public Health Service, or National Atmospheric and Oceanic Administration whose rank is above an ensign and below a lieutenant. 

How often have the words gonfalon and lieutenant junior grade occurred in a corpus of books? (source: Google Ngram Viewer )