Are the US national park rangers the only ones with straight brim hats or do other departments use them too?

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Several U.S. state police services and some local police (including numerous county sheriffs' services) wear campaign hats. So common is it among state highway police that they are sometimes referred to as "smokeys," after Smokey Bear, the logo-character of the United States Forest Service who wears one (though state police have no relationship to the Forest Service, the nickname was born of the physical similarity with the cartoon figure). Many other police agencies use the campaign hats for particular duties or divisions; for example, officers of the Los Angeles Police Department's and Chicago Police Department's mounted units, and deputy sheriffs assigned as cadre of the Cook County Sheriff's Boot Camp wear campaign hats. http://en.wikipedia.org/wiki/Campaign_hat Oct 01 09, 3:39 AM