A cop mustache, also known as the "military mustache" or "copstache," is a basic piece of facial hair worn between the upper lip and the nose that does not extend any further on the face. This style of facial hair is popular with members of police forces and the military because uniforms and dress codes do not often allow other types of facial hair to be worn.
Philips states that the cop mustache is a popular facial-hair style for police officers because it creates an instant sense of authority. To style the cop mustache, the shaver must trim all of the stubs on his face to about 3 to 5 millimeters. He must then use a precision trimmer to trim the top edge of the mustache so that it creates a straight vertical line on the top with slightly curved edges extending 1/4 inch past the sides of the mouth. A comb must be used to trim the mustache so that it is neat and well-maintained while still being full and luxurious. After trimming, a complete shave with an electric or manual razor finishes the official cop mustache look.
In popular culture, the cop mustache has been successfully worn by Dennis Franz in "NYPD Blue," Tom Selleck in "Magnum P.I.," Danny Glover in the "Lethal Weapon" franchise, Kevin James in "Paul Blart: Mall Cop" and the entire male cast of the Broken Lizard movie "Super Troopers."