Very true, I am usually the real world bloke asking why we are introducing something new or unique when there's already something suitable in use. It could be a single bolt or an entire platform but it is always worth a look at where you can achieve commonality just so long as you don't go stupid, or make too many sacrifices, trying to achieve it.
What I'm proposing is complete fantasy and pretty unjustifiable, the only possible justification could be the units in question are actually aligned with larger formations within an alliance structure and as such the commonality required is with those allied organisations not the ADF.
The RAM is easy, they would have been closely aligned with the USMC and simply slotted into their logistics tail, we could even say that there was a joint training facility and prepositioned USMC equipment in Australia in an arrangement going back to WWII. The equipment of the RAM with USMC standard gear could have been payment for the Australian facility.
Maybe the Tank Brigade could be an integral part of BAOR, rotating regiments through Germany, there would of course also be other elements, infantry, artillery, engineers. Still thinking on the way forward, does my Tank Brigade support my armoured infantry or is it used to harden my light infantry? If the later that means I get to add heavy armour to my armoured infantry ORBAT. Maybe Hetzer, replaced by E-10 with 77mm HV, a 20pdr casemate TD (maybe a modified Kanonenjagdpanzer) as a replacement for the 6pdrs of the AT platoon and how about light tanks on a reconnaissance platoon? If I'm being silly I may as well go all the way
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The Armoured Cavalry Regiments will be the cornerstone of continental defence and as such the only armoured force that actually requires a unique Australian logistics structure. I just need to decide whether the armoured infantry ties in with the ACRs or the Tank Brigade. It doesn't really matter as I can start building and sort out the back stories later.
1. ACR set up for continental defence, only deployed outside Australia in dire circumstances
2. Commonwealth solidarity sees Australia commit to NATO and rotate a tank battalion through BAOR, the rest of the Tank Brigade is assigned as reinforcements and even deploys during Reforger exercises.
3. The RAM armour is pretty much identical in doctrine, structure and equipment to the USMC, is designed to seamlessly integrate with the USMC and forms part of Australia's primary expeditionary capability.