The United States Marine Corps as part of its basic training teaches its recruits Marine Corps LINE Combat system.

LINE Stands for Linear Involuntary Neurological overide Engagement

It's a martial art that relies on training the bodies reflexes. This martial art is considered quite lethal, and is readily taught to anyone who qualifies to join the Marine Corps. It's made from parts of several other proven Martial Arts that make this hand to hand combat style effective.

The system has currently been replaced by the Marine Corps Martial Arts Program (MCMAP).