Olena
If you have a preference then stick to it. However if you really just want in than by all means put down all services as first preference. This also means that you will have some knowledge of all three services, operations, etc.
I am not to certain what you mean by waiting in vain for 12 months when you could have been finishing NEOC if you were to include RAAF and ARA as equal first pref. Making other services equal first pref will not put you into the Navy
Bzulu
Understand that people want information but when you are posting statements that are listed as facts than they should be correct, otherwise far better to say " it is my understanding" etc.
It may be better to be left in the dark about how the system works as opposed to having incorrect info on the system.
Your false assumption two and " at no time while you are in the navy pool, will you even be considered for the other services" I believe is not correct.
It is my understanding that you can still be considered for other services apart from your first preference. The way I believe this works is if you are passed over for your first pref (read others more competetive) but are still rated better than others in your 2nd/3rd pref/or there are no others in those pools you may be offered a considerd for those services.