United States Marine Corps Recruit Training, commonly known as "boot camp", is a 13 week program of initial training that each recruit must successfully complete in order to join the United States Marine Corps. All enlisted individuals entering the Marine Corps, regardless of eventual active or reserve duty status, will undergo recruit training at one of the two Marine Corps Recruit Depots (MCRD): Parris Island, South Carolina, or San Diego, California. Male recruits from the 8th, 9th and 12th recruiting districts (predominantly areas west of the Mississippi River) are sent to MCRD San Diego. All recruits from the 1st, 4th and 6th recruiting districts, are sent to Parris Island. Those desiring to become officers attend training at Officer Candidates School.