In a 1942 educational pamphlet published by the US Army, entitled "A Pocket Guide to China," there is a section in there pointedly called "How to Spot a Jap." In this section, the reader is helpfully guided with illustrations on how to distinguish between "the Japs and our Oriental allies."
I'm sure there are similar guides produced by the military today that helps its soldiers and contractors discriminate between "the peaceful Iraqi and the insurgent."
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P.S. To those of you reading this today and you don't know: Nowadays, it is NOT cool to call people "Japs" or "Orientals." FYI.