OPUS means OSS/PODPS Observation Support System/Post-Observation Data Processing System Unified System in Military
Similar to OPUS
11AD - 11th Airborne Division11B - Military Occupational Specialty for Infantryman
11z - Command Sergeant Major Military Occupational Specialty code
12 WVI - Twelvth West Virginia Infantry Regiment
121ARW - 121st Air Refueling Wing
129 RQW - 129th Rescue Wing
12N - Horizontal Construction Engineer
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