Whilst the C-27J and C-130J do, potentially offer a virtual common type rating, it is unlikely the RAAF would use this in practice due to its conservative type streaming practices.
The advantages of the C-27J are many - there are several dozen in service or on order by European nations and, unless something goes awry, it will likely be chosen for the 200+ order for the USAF/US Army JCA program early in the new year; it shares common engines and avionics systems with the C-130J, therefore reducing the support and spares streams required; its smaller size, ability to be refuelled in flight, and NVG compatible cockpit has much special forces support work potential; and it carries C-130-compatible pallets (
old faithful may be able to elaborate on the importance of this seeing as he has AMTDU time
).
Perhaps more importantly, ALG has determined that, given a capable EW kit, a C-27J could probably handle about 90% of the missions currently being flown by C-130Js in the MEAO, with the only exceptions perhaps being some of the longer range support missions up into Afghanistan. Further, a smaller and lighter twin like the C-27J could operate into some of the shorter, narrower and/or higher strips currently off limits to the Hercs.
Re the C-130J tankers - there is currently an internal study looking at whether to go for the proven shorter fuselage model as used by the USMC, or to see if the longer fuselage -30 can be certified for pods and hoses. The pods are quite draggy and would need to be cleared by LockMart and ARDU, as would any CofG issues. The fuel bladders for AAR missions are pallet mounted and can be quickly removed for conventional cargo missions.
Re more C-17s - don't count on it. I think there are additional tankers on the wish-list ahead of more C-17s. The C-17s will offer a relatively niche bulky/heavy lifting capability unmatched by anything else around, but a cargo-convertible KC-30B (if the cargo option is taken once Airbus finally gets round to launchung the A330-200F) should be able to handle most light to medium weight, medium to long-range lift missions with one stop to the MEAO and non-stop to our regional neighbours. This would include light vehicles, field hospitals and medical equipment, and other civil defence related equipment which may be too much for one Herc.
Magoo