https://www.milsurps.com/images/impo...ATT36530-1.jpg
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Cool poster. Interesting note: it appears that the rifle is an M1903, but the grips on the bayonet appear consistant with the M1917 bayo. Thanks for sharing.
The picture was also based on a French poster from WWI, which showed a (French) soldier in almost the same pose.
I expect that the artist had a 1903 and a 1917 bayonet (or maybe just pictures) to use as models and not knowing anything about either one, just put the bayonet on the rifle, at least on paper.
Here's the French poster from World War I that the U.S. poster in the first post was based on together with the U.S poster - notice the similarities.
https://www.milsurps.com/images/impo...standard-6.jpg
https://www.milsurps.com/images/impo...ATT36530-1.jpg