The School of Infantry (SOI) is the second stage of initial military training for enlisted United States Marines after Recruit Training. Since the initial training pipeline is divided between coasts, Marines from areas east of the Mississippi River usually graduate from MCRD Parris Island and move on to SOI at SOI East (located at Camp Geiger, a satellite facility of Camp Lejeune in North Carolina), while those from the western half of the nation attend MCRD San Diego and move on to SOI West at the Camp San Onofre area of Camp Pendleton in California. While female Marines all used to go through MCRD Parris Island and SOI East, since Spring 2021 they are also being trained at MCRD San Diego. As of March 2018, non-infantry female Marines were integrated into the Marine Combat Training Battal