The United States Marine Corps (USMC) has specific hair regulations for male Marines. These regulations are designed to maintain a professional and uniform appearance among all Marines.
According to the USMC grooming standards, male Marines' hair must be neatly groomed and present a conservative appearance. The hair on top of the head must be short and evenly tapered from the forehead to the back of the neck. The hair on the sides and back of the head must be no longer than 1/4 inch. Additionally, Marines are not allowed to have any facial hair, except for a neatly trimmed mustache.