One of the rules of evidence for RPL applications is currency. This is stipulated by the federal government and specifically, ASQA (the Australian Skills Quality Authority). This ensures that the learning in a particular area has been recent, and is not outdated.
This helps to maintain the high standard of the qualifications awarded through the RPL process.
But, if you have been working in an area post-discharge that builds on the skills you learnt in Defence, your service could still inform your evidence. Plus, RPL is for civvies, too, so we're happy to chat with you about what you've been doing since leaving Defence, and see what you could be eligible for.