NO!
The French ALWAYS carried french rank insignia over american uniforms. US rank insignia are NEVER found in french units.
Ther were different way to wear them, depending on the rank, the branch of service, the piece of clothing and the "fantaisie".
For officers onto the shoulders, on the shielves, or placed onto the jacket's buttons.
Private and NCO, well … pretty much the same!
Private and corporals, "wool" chevron in the colour of the service.
NCOs, gold or silver chevrons (cavalry/armour) according to the service also.
Also, and as far as possible, french head dresses were kept including képi, service caps, berets, and also helmets.
plenty of images onthe french army's photographic service website. Link:
link