Joel at Far Outliers ups the ante on Language Hat's discussion of the origins of kamikaze.
There is nothing intrinsic in kamikaze that suggests suicide (less than there is in an American slogan like "Remember the Alamo!"), but there is a strong suggestion of a devastating air attack on shipping. I wonder if the suicide submarine Kaiten Tokkoutai ('Turn Heaven Special Attack Force') also wore hachimaki with kamikaze written on them. I can't quite make out the characters on the hachimaki in the photos at the link, but I doubt they say 'Safety First'. Like the original kamikaze, the suicide submarines and airplanes both aimed to destroy ships at sea.Asia, World War Two