I am happy to have these new into my collection. Defensively Equipped Merchant Ships (D.E.M.S.)
Introduced under AFO 3210 of 15th July 1943
https://www.navy.gov.au/sites/defaul.../3125-3241.pdf
The red badges are pattern 221A while the gold badge is a private purchase example.
Also see AFO 5523, the blue badges are mentioned.
https://www.navy.gov.au/sites/defaul.../5434-5553.pdf
Barry