Hi Robert,
We recruit directly into the Air Force for Graduate Intelligence Officers. As well as fulfilling the HSC education requirements for officer you would need a uni degree in a science or technology field, or an Arts degree with certain specialisations. Please have a look at
http://www.defencejobs.gov.au/careers_explorer/RAAFMain.html and follow the links to Officer entry/Graduate only/Intelligence for the full education requirements and job description.
You can also have an intelligence career in the Army or the Navy, however you would not enter directly into this career stream. You would need to enter as a Seaman Officer in the Navy or a General Service Officer in the Army. Through the course of your career you may be selected to enter intelligence, however not everyone is given this opportunity so you would need to be prepared for the reality that you may not be selected into this specialist stream.
Officer jobs are always competitive as the Defence Force are looking for people who can demonstrate an ability to lead and have an aptitude in their chosen specialisation.
If you would like to know if the Defence Force is for you, it is best if you contact your local Defence Force Recruiting centre either in person or over the phone. You can discuss all aspects of military lifestyle with a Defence Recruiter.
Regards