SWAT vs truncheon

SWAT

noun

  • A SWAT team 

truncheon

noun

  • A baton, or military staff of command, now especially the stick carried by a police officer. 

  • A short staff, a club; a cudgel. 

  • A penis. 

verb

  • To strike with a truncheon. 

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