CF vs Charlie Foxtrot

CF

phrase
  • carried forward 

noun
  • center front, a line on a pattern marking the center on the front side of a piece of clothing 

adj
  • child-free 

Charlie Foxtrot

noun
  • clusterfuck, abbreviated to "CF" and expressed in the NATO phonetic alphabet. 

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