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According to the AJ-Press book no.81 for the TBF/TBM Avenger , the TBF-1 at the Munda Island in 1943 had the additional machine gun ports painted at the leading edges to make the Avengers look like the Hellcat head on in order to misslead Japanese pilots
At least 1 very successful IJN ace found they looked very much alike Saburō Sakai was almost killed when he mistook a TBF for an F4F (or F6F I can't remember ) from low and behind closing in and receiving a well aimed burst of fire from the defensive guns.Apparently, the Americans considered the Japanese pilots to be special people, capable of not seeing the Avengers big turret in battle, but able to notice and count the small holes on the leading edge of the wing. Thanks for the help!