United States Marine Corps Infantryman MOS 0311 Grunt Combat Tactic 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. The mission of the Marine Corps rifle squad is to “locate, close with, and destroy the enemy by fire and maneuver or to repel the enemy attack by fire and close combat.” This has been the mission since the inception of the United States Marine Corps at Tun Tavern in Philadelphia in 1775. The design consists of a combat skull with crossed weapons, Kevlar and the words Infantry, "mess with the best, die like the rest" USMC infantry since 1775 with the U.S. Flag.