The United States Marine Corps (Usmc) is a branch of the United States armed forces responsible for providing force projection from the sea, using the mobility of the U.S. Navy to rapidly deliver combined-arms task forces. It is one of seven uniformed services of the U.S.. Administratively, the Marine Corps is a component of the Department of the Navy, but it acts operationally as a separate branch of the military, often working closely with US Naval forces for training, transportation, and logistic purposes.   Wikipedia