A good example was the 369th Infantry, formerly the 15th NY. AKA the Harlem Hellfighters. They were attached to the French Army and easily outran their French flanking units in the Meuse-Argonne fight. They were issued French helmets and probably a bunch of other kit as well. I don't know if they carried US or French arms.
The 369th was fmous for its regimental band, led by James Reece Europe, one of the pioneers of jazz.
jn

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