Looking at web browsing history of my web browser, I found proof as seen below that world famous Jankees himself said in his words:
Regards,It is probably not very well known that the RAAF operated one KC-97 in the late '60's to see if refuelling would be an option for the RAAF, which suffered under the 'tyranny of distance'. They borrowed one from the USAF, registered it A97-1 (what's in a name?) and performed a series of secret tests in the vast interior of the country. In the end, they converted a number of Boeing 707's for the refuelling role.
Aharon