Marine vs airman

Marine

noun
  • A member of a marine corps. 

adj
  • Of, or pertaining to, a marine corps. 

airman

noun
  • A naval seaman, especially one in the U.S. Navy, who works on and/or handles aircraft. 

  • A pilot of an aircraft. 

  • A member of an air force. 

  • A person of a rank in the U.S. Air Force above airman basic and below airman first class. 

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