punching bag vs serviceperson

punching bag

noun
  • A person serving as an object of abuse. 

  • A tough bag, usually cylindrical, filled with air, sand, or other material, often suspended so that it swings freely, which is punched or kicked when practising sports such as boxing or martial arts. 

serviceperson

noun
  • A servicemember; a serviceman or servicewoman. 

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