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 are described on this page.
After completing Marine Corps Recruit Training, Marines can become an expert in any number of 300+ MOS, creating a diverse and talented group of modern fighters for our Nation.
MOS training comes in many forms, including
This field includes many "B" Billets that are special duty assignments that fall outside of a Marine's primary MOS and require special permission to enter. Several of these are instructor roles, including Drill Instructors, Combat Instructors, Marksmanship Instructors, Small Weapons Instructors, Water Safety and Survival Instructors, and Martial Arts Instructors.
Marines in this field have duties like welding and metalworking and are responsible for maintenance, operation, and repair of heavy engineering equipment.
All members of an Amphibious Assault Vehicle (AAV) crew perform duties to help with the operation and maintenance of the vehicle and upgunned weapons station. These Marines lead mechanized assaults and conduct amphibious landings.
Marines in this field are responsible for the secure disposal of explosive weaponry and ammunition. This MOS has three enlisted positions: basic ammunition and explosive ordnance disposal Marine, ammunition technician, and explosive ordnance disposal (EOD) technician.
Duties for this MOS focus on strategic and tactical intelligence, listening to radio and other broadcasts to determine enemy positions. It includes jobs like signals intelligence analysts, cryptanalysts, signals intelligence/electronic warfare, and radio reconnaissance.
In this field, Marines perform ground supply administration and operations, including maintaining supply warehouses, ordering and processing equipment, and coordinating the distribution of supplies. Some of the jobs include basic supply administration and operations Marine, warehouse clerk, aviation supply clerk, and contract specialist.
In this field, Marines are responsible for making sure all vehicles used in the field are inspected, maintained and in top condition. They may oversee repair and maintenance of transport equipment as well as service fuel and water tankers and HUMVEEs. This field also includes motor vehicle operators who complete motor transportation school to learn to drive a variety of USMC vehicles.
Marines in legal services assist military officers who have studied law and are licensed attorneys. They must understand various military laws and proceedings to help both Marines and civilians. Jobs include basic legal services Marine, legal services specialist and legal services reporter.
These Marines produce written and visual information products in order to build understanding, credibility, and trust with audiences while advising commanders and staffs on communication strategy matters. Roles include Combat Graphics Specialist, Combat Photographer and Combat Videographer.
The military police and corrections occupational field provides commander support by enforcing the law, preventing crime, preserving military control, investigating offenses, and apprehending offenders. Marines in this field may also be involved in antiterrorism or the handling and safeguarding of prisoners of war, refugees, or evacuees. Jobs in this MOS include military police, working dog handler, military police investigator, criminal investigator CID agent, and correctional specialist.
The aviation MOS is the 6000 field. The first two numbers designate the primary position of mechanic (60), helicopters (61), and fixed-wing aircraft (62). The aircraft maintenance occupational fields include direct and indirect support of the total airframes as well as power plant pack of all aircraft weapons systems. Marines start as basic aircraft maintenance crew and then progress through hard skill MOS. Jobs include helicopter power plants mechanic, airframe mechanic, fixed-wing aircraft mechanic, and unmanned aerial vehicle mechanic.
Marines in the avionics field provide direct and indirect support of aviation weapons systems. As a Marine is promoted within this field, repair and administrative requirements for multiple systems take equal importance until the Marine is placed in a supervisory position. There are a wide variety of jobs in avionics, including unmanned aerial vehicle avionics technician, aircraft avionics technician, communications/navigation systems technician, and cryptographic systems technician.
This occupational field includes organizational and intermediate maintenance of guns, gun pods, aircraft weapons systems, bomb racks, missile launches, and aviation ordnance support equipment.
This field includes the operation and management of air command and functions associated with the Marine aircraft wing. It includes jobs like air control electronics operator and air traffic controller.