death march vs memorial service

death march

noun
  • Synonym of dead march (“mournful music for a funeral etc.”) 

  • A forced movement of people, on foot, in such circumstances that many die during the journey. 

  • A project that requires a stretch of unsustainable overwork, or whose participants feel it is destined to fail. 

memorial service

noun
  • An informal service honoring a deceased person, especially one that does not adhere to the traditional customs of a funeral. 

  • A ceremony to honor a deceased person; a funeral. 

How often have the words death march and memorial service occurred in a corpus of books? (source: Google Ngram Viewer )