The second stage of initial military training for enlisted U.S. Marines after Recruit Training is the School of Infantry (SOI), where “every Marine comes to become a rifleman”. The School of Infantry training mission ensures that “every Marine is, first and foremost, a Rifleman.” This is, without a doubt, one of the most important features of the makeup of the U.S. Marine Corps. Because of that, infantry training at both SOI East and West, is extremely rigorous as well as physically and mentally demanding.
As the video shows and explains, since the initial training pipeline is divided between coasts, Marines from areas east of the Mississippi River usually graduate from Marine Corps Recruit Depot (MCRD) Parris Island, and move on to SOI at SOI East (located at Camp Geiger, a satellite facility of MCB Camp Lejeune in North Carolina). On the other hand, recently graduated Marines from the western half of the nation attend MCRD San Diego and move on to SOI West at the Camp San Onofre area of MCB Camp Pendleton in California. The only exception to this is for Female Marines, all of whom go through MCRD Parris Island and SOI East.