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Operational Readiness
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Operational Rations
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Operations Research
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Other RankS NATO
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Operational Requirement
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Official Regulation
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Similar to OR
189FA - 189th Field Artillery Regiment
1BCT - First Brigade Combat Team
1CAV - 1st Cavalry Division
1CD - 1st Cavalry Division
1LT - First Lieutenant
1MC - General Announcing System
1MX - 1st Battalion The Middlesex Regiment
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