Iv’e always called them JAPS.
And the reason we had no more nuclear bombs was that we had to use one to test the Fat Man implosion device to see if it would even work and did not yet have enough weapons grade uranium 235 or plutonium 239 accumulated from our reactors to construct another Little Boy or Fat Man bomb at that time. We had to bluff the Japs.
The term “Japs” is no different from calling African Americans “N*ger”. I hope you don’t use such a racist term again.