The Punch Below The Belt is a 1945 U.S. Military pamphlet, designed to train soldiers in the waning days of the war in the Pacific.  Specifically, the text focuses on the nature of the tactics employed by the Japanese, characterized as deceptive & underhanded.  More than mere enemy-demonizing propaganda, the booklet is an official military training manual, chock-full of staggeringly racist cartoons designed to drive the message home to the G.I.s.  The illustrator, Sam Cobean, like Milton Caniff (a popular cartoonist for the Funny Papers, having written Terry & The Pirates, and Steve Canyon), had work in in Fortune Magazine, The New Yorker, and other collections - not just some hack, but an accomplished illustrator in his own right.

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PS. There's a PDF copy of this book, too.