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Mike,
Unfortunately my memory of the detail on this is vague, but it may be mentioned in 5 RAR's 1968 Training Directives. I had a complete copy which I donated to the AWM in Canberra many years ago. The AWM reference for them is PR85/297 and apparently the collection is held at the Mitchell Annex of the AWM. You could access these and search through the index quite easily. Each trg directive usually covered a single topic.
Good hunting.
Dave