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 and is one of seven uniformed services. Administratively within the Department of the Navy, operationally the U.S. Marine Corps acts as a separate branch of the military, often working closely with US Naval forces for training, transportation, and logistic purposes.Originally organized as the Continental Marines on November 10 1775 as naval infantry, the Marine Corps has evolved in its mission with changing military doctrine and American foreign policy. The Marine Corps has served in every American armed conflict including the Revolutionary War. It attained prominence in the 20th century when its theories and practice of amphibious warfare proved prescient and ultimately formed the cornerstone of the Pacific campaign of World War II.By the mid 20th century, the Marine Corps had become the dominant theorist and practitioner of amphibious warfare. Its ability to respond rapidly to regional crises has made it, and continues to make it, an important body in the implementation and execution of American foreign policy.