Army 31D MOS Overview: Criminal Investigations Agent

This is an Army job with a lot of potential for after Army service. Not to mention, the Army is in need of Criminal Investigations Agents.

Today, I am going to provide you with an overview of the Army 31D military occupational specialty (MOS). I will give you a basic job description, the responsibilities and duties of the 31D, what requirements there are to get this job and the training required.

Hopefully, this post will help you in your career decisions and please share it with others who may be considering a career in Army CID.

Army 31D Basic Job Description

The Army 31D, Criminal Investigations Agent investigates any felony level crime that has any type of Army involvement whatsoever. This could be Army personnel, equipment or anything that has to do with the United States Army; on or off Army owned property.

Army 31D Responsibilities And Duties

While it would be impossible to list every responsibility of the Criminal Investigations Agent, I am going to list the primary duties and responsibilities…

  • To conduct independent crime investigations that are at felony level. These may include economic, general, drug, espionage, treason and crimes of that sort.
  • Interviewing witnesses.
  • Question suspects.
  • Maintain Army records.
  • Provide support for forensics.
  • Protective services.

These are just a few of the responsibilities and duties. Keep in mind that a 31D is a Federal Agent who has been swore in. 31D’s are often on their own meaning, they make decisions on spur of the moment. But it is still wise that they always run it by the chain of command.

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Requirements To Become an Army 31D

The position of Army 31D, Criminal Investigations Agent is not an entry level Army job. One of the first requirements is that soldiers must have at least 2 years of service but under 10 years. He/she must also be at least a Sergeant rank.

Let’s look at the requirements:

  • Must be a U.S. citizen
  • 21 or older
  • Must have completed the Basic Leader Course
  • Must have 60 hours from an accredited higher learning institution
  • ASVAB scores of 107+ in Skilled Technical and 110+ in General Technical
  • Meet all Army height and weight standards
  • Normal color vision
  • A good credit history
  • No unfavorable judgments in civil or military courts

These are just a few of the requirements.

Training For The Army 31D

Since this MOS is not entry level, the soldier will have already completed Basic Combat Training. Once accepted to train for Army 31D, the soldier will go to Fort Leonard Wood, Missouri for the CID Special Agent’s Course that lasts for just under 5 months long.

Once you pass that course, you will be given a duty station. But keep in mind that more education is always a must in this job.

You will be assigned to a team and the basic teams are:

  • General crimes
  • Special victims
  • Economic crimes
  • and Drug crimes and suppression

Final Thoughts

This is a great career move but do keep in mind that this job is difficult, both mentally and emotionally.

If you have what it takes, I do suggest you Go For IT!

If there are any 31D’s reading this, please tell us more and if you have any questions, just post them below.

Thank you.


chuck holmes

Chuck Holmes
Former Army Major (resigned)

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