Crossword Genius

A call for military revolution (5,4)

Ross

I believe the answer is:

about turn

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'a call' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps you can see a link between them that I don't see?

'military revolution' is the wordplay.
'military' becomes 'about' (I can't justify this - if you can you should give a lot more credence to this answer).
'revolution' becomes 'turn' (I've seen this in another clue).
'about'+'turn'='ABOUT-TURN'

'for' is the link.

Can you help me to learn more?

(Other definitions for about turn that I've seen before include "Total change of policy" , "Major change of attitude" , "order to the troops" , "command from the sergeant major?" , "Total change of direction" .)

I've seen this clue in The Globe and Mail.
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