Marine Corps unrestricted line officer, limited duty officer, and warrant officer jobs have specific designators, called "Military Occupational Specialties," or MOS. Similar MOS's are grouped together into occupational fields. Below are the occupational fields for Marine Corps officer jobs.
01 -- Personnel, Administration, and Retention
02 -- Intelligence
03 -- Infantry
05 -- Marine Air Ground Task Force (MAGTF) Plans
06 -- Communications
08 -- Field Artillery
09 -- Training
11 -- Utilities
13 -- Engineer, Construction, Facilities, and Equipment
18 -- Tank and Assault Amphibious Vehicle
21 -- Ground Ordance Maintenance
23 -- Ammunition and Explosive Ordnance Disposal
26 -- Signals Intelligence/Ground Electronic Warfare
27 -- Linquist
28 -- Ground Electronics Maintenance
30 -- Supply Administration and Operations
31 -- Traffic Management
33 -- Food Service
34 -- Financial Management
41 -- Marine Corps Community Services
43 -- Public Affairs
44 -- Legal Services
46 -- Combat Camera (COMCAM)
48 -- Recruiting
55 -- Music
57 -- Chemical, Biological, Radiological and Nuclear (CBRN) Defense
58 -- Military Police and Corrections
59 -- Electronics Maintenance
60 -- Aircraft Maintenance
63 -- Avionics
65 -- Aviation Ordnance
66 -- Aviation Logistics
68 -- Metorology and Oceanography (METOC)
70 -- Airfield Services
72 -- Air Control/Air Support/AntiAir Warfare/Air Traffic Control
73 -- Navigation Officer and Enlisted Flight Crews
75 -- Pilots, Naval Flight Officers
80 -- Miscellaneous Requirements MOS's
