The document discusses the history and role of the United States Marines. It details some of the major wars Marines have fought in, such as World War II and the Vietnam War. It also lists some of the vehicles and weapons Marines use in combat, including tanks, armored personnel carriers, Humvees, and assault rifles. The document explains that Marines fight to keep their homeland safe and protect their families. It notes that people join the Marines because they are highly respected and want to serve their country, and that boot camp is a challenging 12-week process to become a Marine.