RAAF Pilots have done the following in the US military on exchange at some stage over the last decade (and beyond):
F-15 Pilot (& Nav)
F-18 Pilot
F-16 Pilot
F-111 Pilot (& Nav)
Global Hawk (whatever)
...numerous other types - C-130, KC-135, P3, Trainers, etc.....
...and lets not forget the rotary types too.
They have done this for years, at numerous bases on numerous marks of types and received numerous qualifications - Including Carrier Qual.
This is all in the public domain, and nothing new.
...as far as joining the US military, the BIG issue is the residency/nationality, as well as the minor point of a college degree (Something that few RAAF pilots actually have).