Proper countenance needed for one of the military commands (5,4)

I believe the answer is:

right face

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'one of the military commands' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'proper countenance needed' is the wordplay.
'proper' becomes 'right' (associated in meaning).
'countenance' becomes 'face' (I've seen this before).
'needed' means one lot of letters go next to another.
'right'+'face'='RIGHT FACE'

'for' is the link.

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I've seen this clue in The Irish News.

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