armed robbery vs moonlight requisition

armed robbery

noun
  • An theft where the thieves are carrying weapons. 

moonlight requisition

noun
  • Theft or receipt of stolen goods. 

  • Unauthorized taking of materiel; theft of supplies for use in one's own unit. 

verb
  • To steal or use materiel without authorization. 

How often have the words armed robbery and moonlight requisition occurred in a corpus of books? (source: Google Ngram Viewer )