Army Criminal Investigation Special Agent (MOS 31D)

Army Criminal Investigations Special Agent (MOS 31D): Career Details

Army Criminal Investigations Special Agent (MOS 31D) are responsible for completing criminal investigations that involve, or may involve, the Army and it’s assets. 

These specialist are highly trained individuals who work with felony-level crimes.

Individuals in this position must be knowledgeable in civil and military laws and will conduct independent felony-level criminal investigations.

Qualification and Training

This position has more requirements than some other positions in the Army.

The strict requirements are due to the nature of the work being performed.

Having high moral standards and integrity are important in this position as the efficiency at which the work is performed could be the difference between someone walking free or being charged for a crime.

This position is open to In-service soldiers with between 2 and 10 years of Military experience.

They must be a U.S. Citizen, at least 21 years old and have completed the Basic Leader Course (previously Warrior Leader Course).

Other requirements include:

  • SPC-SGT (P)
  • Score of 107+ on the Skilled Technical (ST) and 110+ on the General Technical (GT) portions of the ASVAB test.
  • Ability to consistently pass the height and weight standards in the AR 600-9 and the Army’s Physical Fitness Test
  • No physical limitations or history of colorblindness
  • Favorable credit history and driving record
  • Communication skills including speaking and writing clearly
  • 60+ semester hours from an accredited institution
  • Ability to deploy to any location
  • Valid drivers license

Training as an MOS 31D consists of 15 weeks at a resident course.

During training individuals will learn about any Army related criminal investigation practices and procedures.

 Related Article: Army Counterintelligence Agent (MOS 35L): Career Details

What Does an Army Criminal Investigation Special Agent do?

Army Criminal Investigation Special Agent
Army Criminal Investigations Special Agent processing a crime scene. Image: wikimedia

Army CID (Criminal Investigation Division) Special Agents complete investigation procedures and techniques on felony crimes that either involve Army personnel or property.

This position is ideal for anyone who is interested in law enforcement and can remain calm in high-stress situations.

It can be potentially dangerous work and the crime scenes that you will investigate can sometimes have unfavorable content.

Their job duties can include crime scene processing, collecting testimonial evidence, providing protective services, preventing child abuse and conducting crisis/hostage negotiations.

The felony crimes that they investigate may be General and Economic Crimes or part of Counter-Drug Operations.

Special Agents work with advanced technology and forensic laboratories to complete their job. 

They also conduct interviews and interrogations of complaints, witnesses, subjects and victims.

Knowing proper interview/interrogation procedure and laws are required to ensure that the information they receive can be used in court.

CID Agents should be observant and know how to use all techniques in order to identify, collect and process evidence at a crime scene.

Processing evidence at a crime scene can give the investigator a story line and time-line to work off of.

Special Agents will be required to be familiar with and use the latest technology to complete crime scene analysis.

One of these tools is a Laser Scanner that can take measurements and panoramic pictures of a crime scene to reconstruct later.

Once in the Criminal Investigations Special Agent position, there are opportunities to apply and attend training for specialized fields.

Advanced training opportunities are available for select agents at:

  • Defense Cyber Investigations Training Academy
  • Defense Academy of Credibility Assessment
  • FBI Academy
  • Federal Law Enforcement Training Center
  • Canadian Police College
  • Scotland Yard

While these training opportunities are not awarded to everyone, they allow select individuals to gain skills in specialized areas that benefit both Military and civilian careers.

 Related Article: Army Military Working Dog Handler (MOS 31K): Career Details

What Does a Criminal Investigations Special Agent (31D) get Paid?

Because this position requires at least two years of Military experience and SPC-SGT (P), the pay will greatly depend on how much experience you have when entering into it and the rank you hold at that time.

The base pay table below gives an idea on what the base pay might look like for this MOS.

InsigniaPay GradeRankAbbreviationMinimum Monthly Pay
E-2Private Second ClassPV2$1,943
army e 3 insignia - pfcE-3Private First ClassPFC$2,043
army e 4 insignia - specialistE-4SpecialistSPC$2,263
army e 4 insignia - corporalE-4CorporalCPL$2,263
E-6Staff SergeantSSG$2,694
E-7Sergeant First ClassSFC$3,114
army e 8 insignia - master sergeantE-8Master SergeantMSG$4,480
E-8First Sergeant1SG$4,480
E-9Sergeant MajorSGM$5,473
E-9Command Sergeant MajorCSM$5,473
e 9 sergeant major of the army insigniaE-9Sergeant Major of the ArmySMA$5,473


In addition to the base pay above, individuals will be given benefits and compensation opportunities.

The Army pays for housing and food while living on base.

Benefits/Compensation also includes:

  • Insurance: Free/Low-cost medical and dental
  • Paid sick time
  • 30 days vacation annually
  • Annual clothing allowance
  • Education tuition assistance
  • Low-cost life insurance
  • Compensation for situations such as deployment

Related Article: Army Military Police (MOS 31B): Career Details

Job Reviews

This position can be very challenging physically and emotionally.

People in this position feel that they make a positive difference and express the learning opportunities presented to them.

At times this position may have regular hours, at other times you will be called at odd hours and required to come to work.

Negative reviews of this position note high workloads and deadlines.

Positive reviews of the position discuss the growth opportunities and completing work that can be rewarding.

A few job reviews from Agents in the CID can be found below.

Image: Indeed
Army MOS 31D
Image: Indeed

Civilian Career Opportunities

This position provides skills that could be used in federal, state and local law enforcement.

Other opportunities working with law enforcement could be on child abuse cases, hostage negotiation and crime prevention.

Job titles include:

  • Criminal Investigators
  • Police Detective
  • Sheriff
  • Emergency Management Director

Working in this MOS will also provide training opportunities for certain certifications while in the Army that will allow for higher positions as a civilian.

These positions vary in pay, but the discipline and skills learned as an Army Criminal Investigations Special Agent allow for pay negotiations and higher position opportunities.


Criminal Investigation Special Agent (MOS 31D)
Army Criminal Investigations Special Agents during a exercise on criminal investigation job functions. Image:

Army Criminal Investigations Special Agent (MOS 31D) are responsible for investigating crime scenes for matters involving the Army and Army assets.

Criminal Investigations Special Agents handle matters that involve felony crimes and can complete tasks from crime scene evidence collection to interrogations.

This position requires previous Military experience and secret-security clearances.

Previous special agents enjoy the work that they do and discuss how rewarding it can be when their work leads to a conviction.

Working in this MOS opens the door for civilian law enforcement positions all across the U.S.

Related Article: Army Interpreter (MOS 09L)


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