Marine Corps (USMC) Enlisted Job Descriptions
OCCUPATIONAL FIELD 8000 TO 9599, CATEGORY B MOSs
A Category B MOS is a short-term duty assignment. Enlisted members who are performing duties in these MOS's return to their primary MOS once the duty-period has been completed. Enlisted personnel are promoted within their primary MOS while they are performing duties in a Category B Billet.
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Category
B MOS's
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| MOS | Job Title | Authorized Ranks |
| 8111 | Combat Rubber Reconnaissance Craft (CRRC) Coxswain | SSgt to PFC |
| 8112 | Riverine Assault Craft (RAC) Crewman | GySgt to PFC |
| 8114 | Rigid Raiding Craft (RRC) Coxswain | SSgt to PFC |
| 8151 | Guard | GySgt to Pvt |
| 8152 | Marine Corps Security Force (MCSF) Guard | GySgt to Pvt |
| 8153 | Marine Corps Security Force (MCSF) Cadre Trainer | GySgt to Cpl |
| 8154 | Marine Corps Security Force (MCSF) Close Quarters Battle (CQB) Team Member | SSgt to LCpl |
| 8211 | Education Assistant | GySgt to Pvt |
| 8411 | Recruiter | SSgt to Sgt |
| 8412 | Career Recruiter | MGySgt to GySgt |
| 8421 | Career Planner | MGySgt to Sgt |
| 8431 | Psychological Operations Noncommissioned Officer | GySgt to Cpl |
| 8441 | Civil Affairs Noncommissioned Officer | GySgt to Cpl |
| 8511 | Drill Instructor | SgtMaj/MGySgt to Sgt |
| 8530 | Marksmanship Coach | Sgt to PFC |
| 8531 | Marksmanship Instructor | MGySgt to Sgt |
| 8532 | Small Arms Weapons Instructor | MGySgt to Sgt |
| 8534 | Equal Opportunity Advisor (EOA) | MGySgt to SSgt |
| 8538 | Substance Abuse Counselor | MGySgt to Sgt |
| 8541 | Scout Sniper | GySgt to Pvt |
| 8551 | Close Combat Instructor | MGySgt to Cpl |
| 8552 | Close Combat Instructor-Trainer | MGySgt to Sgt |
| 8563 | Water Safety/Survival Instructor | MGySgt to Pvt |
| 8611 | Interpreter (Designated Language) | MGySgt to Pvt |
| 8621 | Surveillance Sensor Operator | MGySgt to Pvt |
| 8641 | Microminiature Repairer | MGySgt to LCpl |
| 8652 | Reconnaissance Man, Parachute Qualified | SgtMaj/MgySgt to Pvt |
| 8653 | Reconnaissance Man, SCUBA/UBA Qualified | SgtMaj/MgySgt to Pvt |
| 8654 | Reconnaissance Man, Parachute and SCUBA/UBA Qualified | SgtMaj/MGySgt to Pvt |
| 8711 | Ground Operations Specialist | MGySgt to Cpl |
| 8811 | Firefighter | GySgt to Pvt |
| 8911 | Barracks and Grounds Marine | GySgt to Pvt |
| 8915 | Food Service Attendant | LCpl to Pvt |
| 8921 | Athletic and Recreation Assistant | MGySgt to Pvt |
| 9051 | Graves Registration Specialist | MGySgt to LCpl |