Issues regarding the current historical outlook on the war exist . For example , the Japanese government has been accused of historical revisionism by allowing the approval of a few school textbooks omitting or glossing over Japan 's militant past , although the most recent controversial book , the '' New History Textbook '' was used by only 0.039 % of junior high schools in Japan and despite the efforts of the Japanese nationalist textbook reformers , by the late 1990s the most common Japanese schoolbooks contained references to , for instance , the Nanjing Massacre , Unit 731 , and the comfort women of World War II , all historical issues which have faced challenges from ultranationalists in the past
Unit 731
Unit 731
Second Sino-Japanese War