US Marine Corps
The United States Marine Corps, is the maritime land force service branch of the United States Armed Forces responsible for conducting expeditionary and amphibious operations through combined arms, implementing its own infantry, artillery, aerial, and special operations forces.
Marines are trained in many different roles but fight each battle together, positioning our Nation out front to win on any front. There are hundreds of these roles available for aspiring Marines, roles the Marine Corps refers to as Military Occupational Specialties (MOS). These MOS are categorized into Military Occupational Fields, most of which you can find here to view the details.