The Quack - a prison guard at Ofuna - seemed to take great pleasure in harming Allied prisoners of war. Charged with war crimes, he was convicted and sentenced to a long term at Sugamo Prison. He was released, as a result of the General Amnesty, in 1952.
Described by former POWs, in their various war memoirs, the Quack was high on everyone's list of most-detested people. In his oral history, Louis Zamperini explains why:
...That one was what we called a quack, he was like a medical aid. He did patch up little things there in prison camp, but he also took over the disciplinary job of the camp and almost beat some men to death.
General Harris was in charge of all Marine air corps, and his son [Bill Harris] was a big 6-foot-10 Marine in prison camp with me. He became a close buddy of mine, and he was beaten until he was unconscious, then the quack jumped on him for another five minutes, kicking him. (Louis Zamperini, Oral History, Amateur Athletic Foundation of Los Angeles, page 93.)
Zamp describes the Quack in much greater detail, in Devil at My Heels - see page 145, for example - as does Laura Hillenbrand, in Unbroken.
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Image online, U.S. National Archives.