In the days of the Waratah type Tac sign, the country's military areas were known as Commands, and the country was divided into separate Commands basically by states. Therefore travelling counter-clockwise the areas were:
Qld being Northern ( Crown superimposed on Queen Victoria's Cross on a white or khaki background.), now 1st Mil District
NSW being Eastern (Red Waratah on a blue background), now 2nd Mil District
Vic being Southern(Crown sitting atop a shield containing the Southern Cross on grey background), now 3rd Mil District
SA being Central ( Magpie in a yellow circle on a brown background), now 4th Mil District
WA being Western (Black swan on a yellow background) now 5th Mil District
Tas. being Tasmanian (Red rampant lion in gold shield on khaki background) , now 6th Mil District
NT being Northern Territory (a buffalo head in a yellow circle on a green background.) now 7th Mil District
Army Headquarters was the group that controlled the lot of these "commands" and was depicted by a Lion atop the crown shown on a red over blue shield on a yellow or khaki background. Army Headquarters looked after things that affected the Army as a whole rather than as a State entity, such as Recruit training, OCS, Duntroon and the likes of such.
These Tac signs would have been common on all Austin Champs, Series 2s and early S2as in service, the system changing about the time of the intro of S3s, whilst they were serving here in Australia.
When a force was deployed overseas, such as the BCOF & ANZUK forces or SVN, then a separate "Command" area was set up and the appropriate Tac signs designed to cover that force. The actual design of these signs was set up here in Australia but the production of same was usually a local unit effort copied from drawings from SOVOS of the day, hence there are certain variations from the original design. (In actual fact the AFV Kangaroo or Skippy sign as we know it, originally had two red lines depicting a shield on a yellow background, designed to replicate the South Vietnamese flag to a certain degree, with the Kangaroo enclosed in that shield. I must add, I have never seen one done that way but that was the original design laid out!)
The 1 Div sign was Skippy on crossed swords on a green background. This sign replaced the white "1" in a black pentagon on a red background in the mid/late 60's. Some units carried the old pentropic sign over to SVN even though, on paper, it had been superseded prior to this.
The crown over the skippy and crossed swords on a red background, was as stated earlier Land Force Command, and this was replaced in about 1987 or so with the "skippy on crossed swords on a green background".
I seem to remember something about "crossed swords" representing the ARA and "crossed bayonets" representing the CMF, whereas "crossed torches" represented the Cadets, but that is a bit far back in my memory now.
Mick, I think that the modern logistical Transport Units such as 26 use the whole horse (Clydesdale?) on their signs rather than just the Horse's head. The Horse head was representative of a specific unit, that being 1 ALSG.
Actually 26 Tpt Sqn (510) comes under 9 FSB which is represented by 9 over 511. They do have their own Platoon markings on the doors though in the form of a "camel" or a "roadrunner" emblem.
The important thing about all this above guff, is the 'time frames' of these signs. It is very easy to make an inadvertent blunder in putting the wrong era signs on the wrong era vehicle. (A bit like putting a Land Rover in a WWll movie.) This possibly doesn't mean much at all to the general public, but if you wish to use the vehicle on Anzac Day, that is when you will possibly find the people who will pick it up.
Regards
Glen