A little story about quotes. At the battle of Bastogne, General MacAuliffe replied to the Wehrmacht's demand that he surrender with the one word "nuts".
https://en.wikipedia.org/wiki/Siege_of_Bastogne
I didn't believe it. Does that sound like something a GI would ever say? So I asked my dad (WW2, USAF vet and historian) was that quote true? Turns out, my dad had worked briefly for MacAuliffe, didn't believe it either. He asked MacAuliffe, who laughed, and said replied "what the hell do you think I said?"
I.e. the actual reply was "fuck you". Now that I can believe. The Stars & Stripes newspaper couldn't print that, so rewrote it as "nuts", and the rest is history.
P.S. what makes "nuts" even less credible is the expectation that the Wehrmacht would know what it meant. For example, at Caltech there were a lot of students from Hong Kong. One of them was a friend of mine, and he asked me, very puzzled, "what does go nuts mean?" I, being the boorish oaf that I am, said "it means go bananas". He looked even more puzzled, so I let him out of his misery saying it meant to go crazy." Ah, he replied.
But I'm sure the Germans knew well what FU meant.