I didn't know that the tank corps ever used the same roundel as the air corps. Does anyone know when the red dot was discontinued? I know the the US Army Air Corps, Navy and USMC dropped the red dot from their aircraft roundels in mid-42 or so as to not be confused with the "meatball" looking emblem of Japan's rising sun on their aircraft.

__________________
On the Plains of Hesitation
lies the blackend bones of countless millions
who, at the dawn of victory sat down to rest,
and resting died....
(author unknown-I wish it was me)