58 Military Police, Investigations, and Corrections
Marine Corps OccFld 58 covers the law-enforcement and confinement side of the force. It includes the Marines who police installations, investigate serious offenses, manage detention operations, and help commanders preserve order and security.
It covers how military police, investigations, and corrections fit together before you narrow down to one billet or one schoolhouse path.
The marines.com 58-field resource page describes the occupational field as providing commander support by enforcing the law, preventing crime, preserving military control, investigating offenses, and apprehending offenders. The current NAVMC 1200.1L MOS Manual expands that picture by adding traffic control, first response, detention operations, and the handling of prisoners, refugees, or evacuees in contingency settings.
OccFld 58 spans installation law enforcement, criminal investigations, detention work, security support, and deployed mobility and rear-area security tasks.
At a Glance
| Area | What to know |
|---|---|
| Field purpose | Enforce the law, preserve order, investigate offenses, and supervise detention or confinement operations |
| Representative enlisted roles | 5811 Military Police, 5821 Criminal Investigator (CID) Agent, 5831 Correction and Detention Specialist |
| Screening themes | Maturity, security eligibility, clean record, and readiness for law-enforcement or detention duties |
| Training anchor | MOS-specific formal schooling at Fort Leonard Wood appears repeatedly across the field |
| Reserve note | Some 58-field opportunities exist on the reserve side, but billet mix depends heavily on unit structure and mission |
Which Role Fits You?
Choose 5811 Military Police if every marine installation operates under law and order because someone is actively maintaining it.
Choose 5821 Criminal Investigator (CID) Agent if building a criminal case is different from making an arrest.
Choose 5831 Correction and Detention Specialist if military correctional work is not a backup plan.
Common Entry Requirements
All enlisted Marines in this occupational field enlist with a minimum AFQT of 31, a high school diploma, U.S. citizenship, and MEPS medical clearance. Boot Camp is the first training gate: 13 weeks at MCRD San Diego or Parris Island. After graduation, Marines complete Marine Combat Training or the Infantry Training Battalion before attending their MOS-specific school. See each role’s profile below for specific ASVAB line scores, training details, and additional requirements.
Career Field Directory
- 5811 Military Police : Every Marine installation operates under law and order because someone is actively maintaining it
- 5821 Criminal Investigator (CID) Agent : Building a criminal case is different from making an arrest
- 5831 Correction and Detention Specialist : Military correctional work is not a backup plan
Related Resources
If you are considering an enlisted 58-field route, start with the ASVAB guide and PiCAT guide to get your score planning straight. Then use How to Enlist and Active vs. Reserve before narrowing down to one law-enforcement or detention track.