The Naval Criminal Investigative Service is a specialized law enforcement agency that has more than 1200 special agents in its service to safeguard the United States Navy and Marine Corps.
Although NCIS agents work for the Navy and Marine Corps., it is not a requirement that they enlist in the Navy or Marine Corps. Furthermore, an NCIS agent does not need to have any previous military or law enforcement experience.
If an applicant has previous military experience, then he or she must submit a Certificate of Release or Discharge from Active Duty.