81 IR ILL means 81mm Mortar Infrared Illumination Round in
Military
Similar to 81 IR ILL
1CAV - 1st Cavalry Division
1CD - 1st Cavalry Division
1LT - First Lieutenant
1MC - General Announcing System
1MX - 1st Battalion The Middlesex Regiment
1NCD - 1st Naval Construction Division
1SG - First Sergeant
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