KD vs khaki drill

KD

noun
  • Kraft Dinner: a packaged dry macaroni and cheese mix. 

  • Compatibility (K) Decomposition 

khaki drill

noun
  • A form of British military uniform made of cotton drill, often used in tropical service. 

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