A uniform is a set of standard clothing worn by members of an organization while participating in that organization’s activity. Modern uniforms are worn by armed forces and paramilitary organisations such as police, emergency services, security guards, in some workplaces and schools and by inmates in prisons. In some countries, some other officials also wear uniforms in their duties; such is the case of the Commissioned Corps of the United States Public Health Service or the French prefects. For some public groups, such as police, it is illegal for non members to wear the uniform. Other uniforms are trade dressed (such as the brown uniforms of UPS).