The RAAF bought F-111Cs brand new off the General Dynamics showroom floor in 1963. Development problems and minor issues such as the wings falling off of USAF F-111As delayed delivery until 1973, flying F-4s as interim aircraft.
After the USAF retired the FB-111A/F-111G (SAC strategic bombers later given to TAC and redesignated F-111G,) the RAAF bought some of those as used.
But the F-111C was and is exclusive to the RAAF.
I remember the FB-111s from Plattsburgh, back in the day.