Does A/g mean Australian Government?

It is used before some titles such as A/g Assistant Secretary. If it is the abbreviation of A/g, why is the g lower-case?
Update: Thank you Mr. Warrior. You just helped me make another guess. It may stand for "Acting". I have found many other examples such as A/g General Manager and A/g Deputy Secretary. It is mostly used in Australian sites, so I first thought it may be related to Australia.
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