Army Criminal Investigations Special Agent (31D) Career – Military Occupational Specialties (MOS)


Criminal investigations special agents are primarily responsible for investigating any criminal allegations/offenses related to the Army.

They handle felony-level crimes that involve Army property and Army personnel.

Job Duties

  • Investigate criminal activities such as espionage, treason and terrorism
  • Interview witnesses and question suspects
  • Collect/analyze criminal intelligence and provide forensic laboratory support
  • Maintain Army criminal records


Those who want to serve must first take the Armed Services Vocational Aptitude Battery, a series of tests that helps you better understand your strengths and identify which Army jobs are best for you.


Job training for a criminal investigations special agent requires completing 20 weeks of a resident course, which is designed to train criminal investigation duties in field units for the Army.

Some of the skills you’ll learn are:

  • Civil and military laws
  • Investigation procedures and techniques
  • Crime scene processing
  • Testimonial evidence

Helpful Skills

  • Interest in law enforcement
  • Willingness to perform potentially dangerous work
  • Ability to make quick decisions
  • Remain calm under heavy duress

Required ASVAB Score(s)

Skilled Technical (ST) : 102