Military policemen scraped out (7)

I believe the answer is:

redcaps

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'military policemen' is the definition.
The definition and answer can be both people as well as being plural nouns.
Perhaps there's a link between them I don't understand?

'scraped out' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'scraped' with letters rearranged gives 'REDCAPS'.

Can you help me to learn more?

(Another definition for redcaps that I've seen is " Military police".)

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