when did the marines separate from the navy
United States Marine Corps The Department of the Navy, led by the Secretary of the Navy, is a military department of the cabinet-level U.S. Department of Defense that oversees the Marine Corps and the Navy. The most senior Marine officer is the Commandant (unless a Marine officer is the Chairman of the Joint Chiefs or Vice Chairman of the Joint Chiefs), responsible to the Secretary of the Navy for organizing, recruiting, training, and equipping the Marine Corps so that its forces are ready for deployment under the operational command of the Combatant Commanders. The Marine Corps is organized into four principal subdivisions: Headquarters Marine Corps (HQMC), the Operating Forces, the Supporting Establishment, and the Marine Forces Reserve (MARFORRES or USMCR).
Hospital corpsman Hospital corpsmen work in a wide variety of capacities and locations, including shore establishments such as naval hospitals and clinics, aboard ships, and as the primary medical caregivers for sailors while underway. Hospital corpsmen are frequently the only medical care-giver available in many fleet or Marine units on extended deployment. In addition, hospital corpsmen perform duties as assistants in the prevention and treatment of disease and injury and assist health care professionals in providing medical care to sailors and their families.