SERVICE OF CHOICE When enlisting as a recruit or poolee in the Marines, you must choose an MOS in your contract. Where you will go for mos training after boot camp will depend on the job you pick and the training it requires. For assistance in your choosing a good MOS for you, focus on the areas you excel in and overall would enjoy doing while serving.
After Graduation from the Marine Combat Training (MCT), Marines will attend schooling for their chosen MOS (MOS School). Marines who choose a non-infantry MOS will go to MOS School while infantry Marines will attend the School of Infantry (SOI) Every MOS has a 4-digit number that corresponds with the title of his/her Military Occupational Specialty. You will have selected an MOS during the enlistment process with one of our recruiters. The first two digits of the MOS are the OCC (Occupational Career Code), plus two additional numbers which define the specialty.