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In any wargame that takes place in modern times it is likely that police may be involved, particularly in the opening parts of the action if the action comes as a surprise. Police are often the first to respond to just about any emergency except in fortified border areas.
So I have a reasonable number of police vehicles and I managed to pick up a new set from Matchbox that includes a police helicopter.
In the USA the police often use the same cars from coast to coast. There are often only one or two vehicles specifically marketed as police cars so their choices are often limited for regular police vehicles. Here are a couple police vehicles by Matchbox and I have several of both.
Police car body styles often don't change much year over year, but the cars themselves often don't last in service for more than a few years. So for miniature purposed you can often keep the same car in service for ten years or more.