Goudie, the expectation is that they would become captain's but if course some didn't. Today, ever onwards has been replaced with onward and out so I guess there is more potential for captaincy.
On the OP, the FJ stream was 1st, Harriet, 2nd Jaguar,3rd F3, last GR.
Navs were similarly F3 if they had the apptitude, GR if they had the potential, Canberra if they needed more experience.
On Multis the best went Nimrod.
But, as mentioned, even if you ticked the right boxes, if there were no slots then tuff titty.