Common colloquialism for policeman.
Pre- and early post-revolution, police badges would be made of copper, giving them their other nick-name, "coppers".
Since then, the Technocracy has cut costs by making all new badges with tin. Tin-men, a harshly derogatory term, is used to infer that an officer has turned in his old badge for hollow patriotism, or that they are a dumb rookie.
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