M0 means Maneuver Control System Workstation class computer unit TCU or HCU in Military
Similar to M0
13 SCVI - 13th South Carolina Volunteer Infantry Regiment13AD - 13th Airborne Division
13B - Military Occupational Specialty code for Cannon Artilleryman
147FA - 147th Field Artillery Regiment
15MG - 15 Militia Group
17AD - 17th Airborne Division
180FA - 180th Field Artillery Regiment
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