I talked with Bryan Cox the other day about Corsair squadron call signs, and though he cannot recall any other squadron's radio call signs, he said that when his squadron, No. 16 Squadron, was operating alongside other Corsairs squadrons as a Wing in attacks (and often two or three, and sometimes even four of the RNZAF's Corsair squadrons would make an attack together) he said No. 16 Squadron was known as Onyx Squadron.
So while flying by themselves radio calls would be for example "Red 3" or "Blue 2" to alert a particular person in a particular section that the call was for them. but as each squadron had a Red, Blue, Green and Yelow section (four aircraft each) the squadron callsign would be used and so it would be "Onyx Red 3" etc.
I would love to know what the call signs were for the other units. So far we know:
The Squadron was nicknamed the ‘Katipo Squadron’, after the rare New Zealand native Katipo spider, a less venomous cousin of the American Black Widow and Australian Red Back spiders. With a Squadron motto of “Patu o Kia Mate” (“Strike to Kill”), a suitably fearsome creature as a symbol was definitely in order. These pictures were published in the New Zealand press in July 1945 to promote the important work of the Squadron in support of Australian troops during the fierce ground fighting on Bougainville.
Well it doesn't prove anything really one way or another but my dad Allan Emett has no recollection of any call signs like those. I would think if little stickers or the like had been applied to their aircraft he most likely would have. Anyhow, that was with 26 sqn which finished their tour on the 10th June 45. The Porton plantation fighting started on the 9th of June. Perhaps with the increased need to have more sqn's involved in a strike they felt they needed extra call signs ?