I reckon I'll probably have a good chance at making pilot.
Start thinking about your academic studies - will the USN accept your Oz degree, for example? Should you (as when applying to join UK armed forces) have lived in the country for a specified number of years before applying, and if not, how do you get round that?
Starting out from outside the US puts you at a disadvantage, I'm certain, but you have the time to pre-empt some of those issues.