A 1995 article by the NYT’s Nicholas Kristof, with an unforgettable, chilling lede:

ORIOKA, Japan— He is a cheerful old farmer who jokes as he serves rice cakes made by his wife, and then he switches easily to explaining what it is like to cut open a 30-year-old man who is tied naked to a bed and dissect him alive, without anesthetic.

“The fellow knew that it was over for him, and so he didn’t struggle when they led him into the room and tied him down,” recalled the 72-year-old farmer, then a medical assistant in a Japanese Army unit in China in World War II. “But when I picked up the scalpel, that’s when he began screaming.

And this dark humor:

Japan’s biological weapons program was born in the 1930’s, in part because Japanese officials were impressed that germ warfare had been banned by the Geneva Convention of 1925. If it was so awful that it had to be banned under international law, the officers reasoned, it must make a great weapon.

And the relevance today, if you believe that those who forget history are doomed to repeat it:

The research was kept secret after the end of the war in part because the United States Army granted immunity from war crimes prosecution to the doctors in exchange for their data. Japanese and American documents show that the United States helped cover up the human experimentation. Instead of putting the ringleaders on trial, it gave them stipends.