The Australian OOB RN7 reposted above is complete rubbish for the reasons others have posted. The "Tasmanian Brigade" as just one example is near impossible! IRL, Tasmania has on paper an infantry Battalion plus a handful of small support units (one artillery battery of just a few 81mm mortars, medical unit, admin and transport (a few trucks). Total manpower right now is about 2-300, with most of them in the infantry "Battalion" (which only has one company with a platoon in Devonport, Launceston and Hobart, the state capital).
The population of the entire state can't support much more than that for long (about 400,000 people) and after the three population centres listed above, the next largest town only has 19,000.
So, a sustainable force of 3,500 in addition to the Tasmanians the writer assigned to his 1st Aus Division? Not a chance!
Also, the 3rd Airborne "Brigade" is nothing more than a Battalion. Last year (2011) it changed from an airborne (Parachute) battalion to only having a "smaller high-readiness Airborne Combat Team".
http://www.3rar.com/3rarhistory.html
I believe the original writer may have been confused about what a "Regiment" is in Australia. Basically, regiment is an infantry term. RAR is Royal Australian Regiment, RNSWR is Royal New South Wales Regiment, RQR is Royal Queensland Regiment and so forth. RAR is regular army, the rest are reserve and organised on state lines. The Tasmanians mentioned above IRL are 12/40 Battalion RTR and a part of 9th Brigade, with in turn is a component of 2nd Division.