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).
Marine Corps Recruit Depot San Diego Marine Corps Recruit Depot (commonly referred to as MCRD) San Diego is a United States Marine Corps military installation in San Diego, California. It lies between San Diego Bay and Interstate 5, adjacent to San Diego International Airport and the former Naval Training Center San Diego.[3] MCRD San Diego's main mission is the initial training of enlisted male recruits living west of the Mississippi River. Over 21,000 recruits are trained each year. The Depot also is the home to the Marine Corps' Recruiter School and Western Recruiting Region's Drill Instructors School.