Is 5821 (Criminal Investigator) a Good MOS?

AIT / Training

16 weeks

Training Location

Fort Leonard Wood, MO

Career Field

Military Police and Corrections

What the Recruiter Says

You'll conduct criminal investigations — felony-level cases involving assault, fraud, drug trafficking, and the full range of serious offenses that occur in the military. Marine criminal investigators develop genuine law enforcement tradecraft: interviewing witnesses, managing evidence chains, writing investigative reports that support prosecution. Federal law enforcement agencies and civilian investigative units actively recruit investigators with this background.

What It's Actually Like

Military criminal investigation is real law enforcement work — the cases are genuine, the prosecutions are real, and the investigative skills transfer directly to civilian law enforcement. You'll handle cases that civilian departments would assign to their most experienced detectives, often with fewer resources and more command involvement than civilian investigators would tolerate. The chain of custody requirements, investigative report standards, and courtroom testimony experience are all legitimate law enforcement credentials. Federal law enforcement agencies — NCIS equivalents, FBI, DEA, ATF — recruit from military CID-equivalent investigators. Civilian police departments and private investigative firms value the background. The cases you work will test your judgment and your persistence in ways that shape your professional character.