The LINE (Linear Infighting Neural Override Engagement) Combat System was a martial arts program used by the United States Marine Corps between 1989 and 1998. The LINE System is a system of close combat. It is a standardized system of close combat skills for every warrior at entry level training.

It is designed to do is give a military unit a close combat system that is the same regardless of MOS, regardless of age and regardless of gender or rank enabling everyone to train together. This gives you a standard, similar to a PT test.

The system was designed to be executed within specific combat conditions: limited visibility, extreme mental and physical fatigue, and when numerically inferior. The system was also designed to be executed within specific training parameters: Not vision dominated, mentally and physically fatigued while wearing full combat gear, techniques easily learned and retained through repetition, and designed to cause death to the opponent.

LINE was adopted by the Marine Corps in 1989 at a Course Content Review Board (CCRB) at Quantico, Virginia. All techniques were demonstrated for and deemed medically feasible by the Armed Forces Medical Examiner and a board of forensic pathologists from the Armed Forces Institute of Pathology (AFIP) in 1991.

LINE was removed in 1998 after a CCRB and was replaced that year by a close combat program more in line with the “millennial” battlefield, where Marines are engaged in many scenarios that require the use of less than lethal force. This system was refined and became the Marine Corps Martial Arts Program (MCMAP) in 2002.

http://www.mardb.com/marine-corps-line-combat-system/