We have chosen 2 of these ships, but to think of them carrying 20x fighter aircraft and still being capable of amphibious operations is to fail to understand exactly how these ships are designed, what they are designed for and exactly how much effort is required to support an entire squadron of strike fighter aircraft at sea.
I don't see permanently embarking 20 F-35B's on the LHD as a possibility. However it is possible for a F-35B to fly from a Raaf base, refuel/rearm two or three times off a LHD and then fly back to the airbase. They can significantly extend loitering and patrolling times out at sea. They can have two or three sitting on deck, waiting to be scrambled saving an hour or two flight time in emergency situations and as a deterent.
Its not ideal, but enough to assist in escorting, patrolling, gathering intel and as a short notice strike asset. The 35 sensors are going to be extremely valuable intel gathering, a flight pass of a single F-35 will tell you enormous amounts about the combat situtation, and allow guided 500lb bombs to deactivate bridges, coms, hardend defences, helicopters (missile), heavy vechicals, airfields etc and its stealthy and a naval launched aircraft could come from any direction. However your limited in that you can only operate near Australian land bases, basically in the region.
In combination with a cavour type carrier (which is only really designed to have 12 F-35 aircraft max 20 would be more like a QE carrier!) or a 3rd LHD (slightly more aviation biased say without a dock), you get the ability to strike from another vector, much further away for much longer periods of time and out of region. You own the airspace where ever it is and makes performing missions at longer distances far safer than through extended refuelling. Sortie rates go through the roof and its a massive force multipler. Australia could then operate completely independantly. Plus you get additional sealift and amphibious capability. While not directly needed now we should build a force that doesn't preclude its inclusion. This role could be filled by an allied ship (USN, USMC, RN, etc). But we should wait and see what we require and what capabilities UAV's will have and if the money/need will be avalible.
With what we are getting (2 LHD) I think 12 F-35B's would be a very useful purchase (take it from the total F-35 purchase). Not to permanently embark on the LHD, but to be used in conjunction with the LHD when they are operating in our region.
As inteligence and patrolling aircraft when the LHD are not operating an amphibious assault would allow Australia to search and scan (and respond in) vast regions of sea and air. 450nm in all directions from each LHD. You could make a 1800nm+ "barrier" in which regular patrols are carried out (every 1 of that 1800nm is flown over every hour).
You can do this without any refueling aircraft so this barrier is in addition to patrols conducted by SH/F35A from bases. This barrier can be beyond 500-600nm off the coast infact building a loop you could easily station it off 900nm from the coast creating a 900nm x 1800nm x 900nm box (or arc) with out a single air refueling asset just using the few measly F-35B and using its combat radius, using the ferry radius in peace time and you can spread things out a whole lot more (say 40% more thats 1300x2500x1300 box or arc). That sort of box would have short sides covering from Brisbane to (nearly) Fiji, the long side would be over 4,500km.This is just on internal fuel, add some drop tanks and .
But the greatest value is you can have aircraft forward based (sitting) on those LHD 24/7 waiting to respond/operate and not have a long flight with refueling needed atleast twice and high sortie rates from those LHD decked aircraft but backed up by land based aircraft doing the hard refuelling runs loaded with tanks.
Add land based F-35A/SH (patrolling the sizes etc) and you can extend this box to be absolutely enormous, with basic refueling it becomes a significant global sized box. You don't need your air refuelling assets sitting way out at sea, flying uneconomical missions, unprotected where every refuel is a life and death mission and hence impossible to regularly patrol or protect or gather hard intel for.
The LHD and F-35B allow us to easily and continously safely operate where it is currently very very difficult for us to currently operate. We can operate in this impossible region everyday, closing the air/sea gap completely.
I "hope" so too, but in reality, I don't see it happening. If it were ever going to happen, the chance passed in November 2007 I'm afraid, with the change of Government...
Well the 4th AWD doesn't have to be ordered NOW. Its quiet feasable to be able to order it in the next term of government. Its still on the cards (although with a slightly lower chance). Given that we are going to build 3 AWD and fit out two LHD's there is enough slack that we can extend the later builds and draw it out longer to make a decision. At that time the budget, recruitment and value may be a lot clearer and the navy can make a stronger argument. The whole idea of the 4th was an incentive build anyway, only to be built if the project was on track. Plus it adds value to ASC. In fact it may be prudent to hold off as by the time the 4th AWD is to be built new technologies may be able to be incorperated or purchased which may be easier if the ship is slight reconfigured or wired during the build.