This looks as if it had been done by the Yes Men, but the WHOIS record tells that it is official.
Seriously, the job of the police is to uphold the law, not to look catch criminals or look cool in their paramilitary gear.
Here's the scary bit: the police relies on the support of the community and yet puts forth that image of itself. If they think that looking that way improves their image one will be better off staying far away both from the citizens of Milwaukee and its police department.