air force vs brigade

air force

noun
  • A unit in the U.S. Air Force larger than a division but smaller than a command. 

  • A branch of the military mainly devoted to air warfare, as opposed to (land) army and navy. 

brigade

noun
  • Military unit composed of several regiments (or battalions) and including soldiers from different arms of service. 

  • A group of people who share views or a specific characteristic. 

  • A group of people organized for a common purpose. 

  • Coordinated online harassment, disruption or influencing, especially organized by an antagonistic website or community. 

verb
  • To harass an individual or community online in a coordinated manner. 

  • To form or unite into a brigade; to group together. 

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