Jack vs second lieutenant

Jack

noun
  • A placeholder or conventional name for any man, particularly a younger, lower-class man. 

  • A jacqueminot rose. 

name
  • An unincorporated community in Dent County, Missouri, United States. 

  • An unincorporated community in Coffee County, Alabama, United States. 

  • A male given name from Hebrew, also used as a pet form of John or more rarely, Jacob. 

  • A surname. 

  • Jack Daniel's, a brand of Tennessee whiskey. 

second lieutenant

noun
  • The lowest rank of a commissioned army officer, below a lieutenant. 

  • The lowest rank of a commissioned officer in the United States Army, United States Air Force, or United States Marine Corps, below a first lieutenant. The rank of second lieutenant is equivalent to the naval rank of ensign. 

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