Topics: US Army War College News & Events
Law enforcement, however, constitutes only part of policing activity.  Policing has included an array of activities in different situations, but the predominant ones are concerned with the preservation of order.  In some societies, in the late 18th and early 19th centuries, these developed within the context of maintaining the class system and the protection of private property.  Many police forces suffer from police corruption to a greater or lesser degree. The police force is usually a public sector service, meaning they are paid through taxes.
Alternative names for police force include constabulary , gendarmerie , police department, police service, crime prevention , protective services, law enforcement agency , civil guard or civic guard. Members may be referred to as police officers , troopers , sheriffs , constables , rangers , peace officers or civic/civil guards. The word police is most universal and can be seen in many non-English speaking countries. 
As police are often interacting with individuals, slang terms are numerous. Many slang terms for police officers are decades or centuries old with lost etymology. One of the oldest, "cop", has largely lost its slang connotations and become a common colloquial term used both by the public and police officers to refer to their profession.