Doesn't matter what the the various parts of armed forces are called.Crock, can please provide me with a translator to interpret whatever it is you've written? I'm an intelligent bloke, but I don't have a clue what you are saying. Mind you, I doubt you do either.
All that matters is their functional roles in the strategic scheme of things.
For Australia this functionality is expeditionary.
The force most identified with expeditionary operations is the USMC
Expeditionary operations are by their vary nature offensive
Within the spectrum of offensive expeditions, and due to the littoral environment, there is a better than 50% chance that over the next 40 years the ADF may be called upon to take the initiative and impose its will on the enemy by assaulting across an opposed beach.
The USMC hasn't got this capability, and neither does the ADF.
This would compromise national security options when the time comes, so needs to be considered now
Is this clear?