When I said Chindit's O.C.A. badge I was referring to the badge worn on the blazer by ex Chindits. I believe that there was also a specific Chindits O.C.A. blazer badge as well.
I have an example of the O.C.A. lapel badge in my collection.
https://www.britishbadgeforum.com/fo...ctureid=116517