Because your employment is not 'employment' under Australian Law, but 'appointment' under the Defence Act, you're not entitled to minimum hourly wage, overtime, or even the right to resign (in your first 6-9 years). This is compensated by "service allowance - $10-15k", however once you divide your total salary into the hours you work, you can be paid as little as $4.50/hour to be in charge of a billion dollar warship.
Real culture for junior officers (at sea and ashore) is toxic, belittling, and at complete odds to Senior Leadership intent.
Expect to be treated (and referred to) as a child for at least the first ten years of your career, with no opportunities for off-model career progression, innovation or growth.
Any form of innovative thinking or non-traditional posting history will halt any opportunities for promotion or advancement.
Senior officers with known (and on record) history of violent, sexist and bullying behaviour are highly promoted (to O5/O6 - three to four ranks below Chief of Navy) as long as "they get the job done".
Real workplace culture is a homophobic and racist "old boys" club with regular transphobic, homophobic, sexist, violent and racist comments made in open workplaces.... but expect to be forced to complete '(not so) voluntary' white ribbon programs so the RAN can maintain its accreditation.
The RAN also has widespread problems with alcohol, drugs, mental health (with suicide and attempted self-harm being a daily-to-weekly occurence), and expect family breakdowns (not helped by acceptance that most married personnel will openly have a "husband or wife" at sea - aka a "sea squarie").
Zero HRM knowledge within the organisation - Career Management Agencies (misnomer) are manned by 'senior junior officers' who've "done their time at sea" and therefore 'understand strategic HR'.
Expect to be regularly told that previous experience, qualifications, and expertise mean nothing now that you're in uniform. Zero interest in innovation at "the staff level" unless it can help earn your boss's boss a medal or commendation.
Almost no individual medals or commendations are awarded to sailors or junior officers; instead commendations are 'rites of passage' for people who've stayed in long enough and made the right people look good.
Woeful administration processes supported by no governance & policy documents and instructions that are 5-10 years old.
Payroll and administration is regularly incorrect - spend a lot of your time chasing incorrect pay, administration of allowances to avoid having your wages docked because payroll screwed up once again.
Deficiencies across the warfare officer branch = expect to have consolidation/post-qualified training minimised to fill gaps in other areas, and then be set up to fail.
Third-world healthcare and health management (months+ waiting time, with a hostile approach to any mental healthcare, and don't expect to be able to have a check up more than once every five years).
Zero transferable skills to take to the outside world - Navy has lost almost all RTO accreditation and courses that used to previously mean your training counted towards Certificates, Graduate Diplomas, or external recognised skills... google "Navy Marine Technicians lawsuit" for a classic example.
IT Software is years if not decades (no exaggeration) old. Expect to spend any time at sea doing administration waiting for computers running Windows 95 and Lotus Notes to open.... one of the currently available (as at August 2018) online training courses is "What's New in Excel 2010".