Educators at the secondary school level who teach History, or Integrated Social Studies more broadly, may be expected to possess at least some passing knowledge of the Holocaust, the genocide perpetrated against European Jews by Nazi Germany in the 1930s and 1940s. Yet, when it comes to the Pacific War and Japanese war crimes and atrocities committed in Asia, significantly less attention and coverage are given. An argument can be made, however, that the scope of Japanese brutality was no less atrocious than that of the Nazis. In particular, Japanese physicians and medical research scientists of the Imperial Japanese Army's Unit 731 conducted gruesome and horrifying experiments on live human beings at a remote laboratory and death camp in China's northeast. This essay attempts to explain why discussion of Unit 731 has been missing from the general coverage of World War II in the secondary school curriculum and makes an argument for its inclusion. The authors posit that the primary reason Unit 731 has not been part of the curriculum thus far is because of the lack of awareness of the subject among teachers and the general public. Moreover, teaching Unit 731 at the secondary school level presents significant challenges, including justifying inclusion given its relative importance to other subject matter when having to meet numerous, restrictive state standards; the question of the age-appropriateness of the subject matter; the paucity of suitable teaching materials; and the apparent reluctance of secondary school-level textbook publishers to incorporate such potentially controversial content.