SOI: School of Infantry
It's What's After Boot Camp
All graduates of Marine Corps recruit training attend the School of Infantry (SOI). At SOI, they will train with one of two training battalions, either MCT or ITB. All non-infantry Marines attend training at Marine Combat Training Battalion (MCT), while infantry Marines (all Marines with a Military Occupational Specialty (MOS) of 03xx) attend training at Infantry Training Battalion (ITB).
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