Green’s Dictionary of Slang

(Aus./US) the Japanese nation, esp. its armed forces.

1943		M. Curtiss Letters Home (1944) 30 May 259: I must close rather hurriedly — I’ve just been told that I’ve got a date with Tojo... [Ibid.] 25 Feb. 271: When the Japs attack they yell ‘Blood for the Empire!’ We would yell back at them ‘Nuts to you Tojo.’.
1945		in T. Shibutani Derelicts of Company K (1978) 198: That’s a Jap for you! Stab-in-the-back kind! They’re just like Tojo.
1953		L. Uris Battle Cry (1964) 422: Hey, Tojo! [...] You bastards sure are lousy shots.
1964		B. Jackson Get Your Ass in the Water (1974) 97: The news he got was a solid sender, / old Tojo was just signing unconditional surrender.
1974		(con. 1945) M. Angelou Gather Together In My Name 3: Hadn’t we all joined together to [...] put that little rice-eating Tojo in his place?