CASA has struggled with this issue for a number of reasons;
1. Lack of internal personnel with the requisite experience on NVG's. Case in point, neither of the current project staff have extensive operational or instructional experience on NVG. That makes it difficult to assess external advice or suggested regulation as the internal staff has no background from which to guage the suggestion.
2. The requirements for aircraft to achieve NVG compatibility have been adhoc and predominantly based on rumour and conjecture.
3. Previous advice on this subject has been based on experiences that are almost a decade old. Not pointing fingers, but some of the pushers for this capability in civil aviation have never actually used the stuff in real operations.
4. A dearth of knowledge on minimum training requirements to achieve competency in the subject. Without clear direction or advice, CASA have floundered and taken advice from poorly informed personnel.
There are people and organisations in Australian aviation that are more than ready to be NVG capable. The fact that EMQ is the only one with tacit endorsement so far says more about their government backed assistance than technical competence in this area. And trusting ex-military instructors is not always a good thing.