SQR-18 means Sonar Tactical Towed Array System in Military
Similar to SQR-18
11z - Command Sergeant Major Military Occupational Specialty code12 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
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