commando vs ground pounder

commando

noun
  • A commando trooper. 

  • A small fighting force specially trained for making quick destructive raids against enemy-held areas. 

  • An organized force of Boer troops in South Africa; a raid by such troops. 

ground pounder

noun
  • A military soldier whose primary role is infantry or the use of ground-based materiel. 

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