United States Marine Corps Infantryman Ka-Bar Combat Knife Training T-Shirt. Digitally Printed on soft superior 100% ring-spun Cotton, Triblend, 50/50 premium Soft Style Quality T-shirts. Not Slim Fit Size XXL is Heavy Cotton. LINE is a close quarters combat system, derived from various martial arts, used by the United States Marine Corps between 1989 and 1998. It was replaced by the Marine Corps Martial Arts Program (MCMAP) as a "revolutionary step in the development of martial arts skills for Marines and replaces all other close-combat related systems preceding its introduction. The back of the design contains Two crossed Ka-Bars with the words RAH and Blood and Guts. The front of the design is the U.S. Flag along with USMC infantry est 1775 and the words "mess with the best, die like the rest" The artwork behind the model is a clear example of the quality of the design printed on the shirt.