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255N is a US Army Military Occupational Specialty code for a Network Management Technician - a Warrant Officer Military Occupational Specialty in the Signal Corps.
In 1995, he enlisted in the United States Army's reserve component Special Operations Command as a Psychological Operations specialist, holding MOS 37F and eventually achieving the grade of Sergeant.
The current list of Army Military Occupational Specialty Codes is published on the United States Army Human Resources Command (HRC) PAMXXI website.