Similar to C-21

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
147FA - 147th Field Artillery Regiment

View all in Military