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Office of the Secretary of Defense
in Military
Officer on Special Duty
in Military
Operational Sequence Diagram
in Military
Operating Strength Deviation
in Military
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Similar to OSD
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
1st - IOC 1st Information Operations Command
Land
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