The usual explanation is that during the "Punitive Expedition" into Mexico in 1916, where Pershing led American soldiers in a long "chase" around northern Mexico after Pancho Villa, the infantry soldiers frequently got covered with dust. It was adobe dust (the same soil used as the primary building material in the southwest), so the mounted soldiers called these dusty infantrymen "adobes". Then it became "dobies". From there it was a short transliteration to "doughboys".
By the way, their sons in the next war did not call themselves "GIs". They called themselves "doughs".
Pershing (a city in Michigan) High School's mascot is the doughboy
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The familiar Spanish soldiers were accustomed to eating the fried dough, and when American soldiers came to fight in WWI they came to love the fired dough, and thus were called doughboys.
I don't know if the term is specific to the WWI or II era but 'Dough Boy' is an alternative term for G.I.s
they called them dough boys
American soldiers were called "doughboys" in World War I. The origin of the nickname is not known for sure but some speculate that it came from the white chalky dust that covered them after a long march.
Dough Boys were the USA soldiers in WWI who wore white belts and to keep them clean made a product like dough to erase and keep their belts white.
American soldiers were referred to as dough boys in Europe during World War 1. It is thought they got this nickname because of the famous fried dumpling that was called a dough boy.
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