Some famous affairs conducted in miltary branch (4)

I believe the answer is:

usaf

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'miltary branch' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'some famous affairs conducted' is the wordplay.
'some' says the answer is hidden in the clue (some parts of the word are used).
'USAF' is hidden in the letters of 'famous affairs conducted'.

'in' acts as a link.

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I've seen this clue in The Irish Times.

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