The RNZAF white metal wings were introduced under ADO A.261/44 of 28th June 1944. The badges introduced where pilots, navigators, air gunners and flight engineers. These are the only 4 designations that were worn during WW2. All others are post war or made in the field.
If you want to know more, including their individual stores numbers please see page 366 of my new book.
https://www.trademe.co.nz/a/marketpl...5&bof=mqCdWYwj
Barry