Similar to OCU-1

12 WVI - Twelvth West Virginia Infantry Regiment
121ARW - 121st Air Refueling Wing
129 RQW - 129th Rescue Wing
12N - Horizontal Construction Engineer
13 SCVI - 13th South Carolina Volunteer Infantry Regiment
13AD - 13th Airborne Division
13B - Military Occupational Specialty code for Cannon Artilleryman

View all in Military