What does this mean?

[Maudie]

Iam researching the army career of my gt uncle in India and in one instance
where he is mentioned on the Military accounts Dept in India his name indicates the following letters
his name is Lt.G.N.Grant I.A.R.O. and the office is given as
Field C.M.A. Poona

Can anyone tell me what the letters stand for?

I assume MA could mean military accounts but what does IARO mean

 

[patrickw]

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[Maudie]

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[patrickw]

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[Minden]

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