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Maybe I do not know some details and difference between "squad , detachment, or unit", but they sound ok.
In this case it is just group of policemen who have order to do some work. Sounds...

As was said in the wiki above, one of the meanings of "наряд" is "order for work". Sometimes it is used in industry. In army it can mean auxilary activities, such as cleaning, serving food, etc, on...