As seen in the attached picture, some US tank crewmen preferred the French tank helmet (in this case, the assistant gunner). What might it have been about the French helmet that made it preferable? Also, would there have been a compatibility issue with the US tank communication equipment? Bonus question: Does anyone know what is located just below the left hip of the driver (lower right)? It seems to be some type of a white container strapped to a canvas or leather briefcase or suitcase.