DSTO is tri-service not RAF - although its now headquartered at RAF St Mawgan. It has had several previous incarnations.
The badges in question were (to my knowledge) worn by UK personnel on exercises like ANGEL THUNDER in the US in the early 2000s. They were also occasionally worn on CS95 but as the unit tends not to wear UK uniforms outside the office/classroom they weren't widely worn. I have examples of both in my collection somewhere if anyone's interested...
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