OS in Military could mean:
Displaying 1-10 of 12 result(s).
OS
Opportunity to Serve
in Military
OS
Overtly Similar
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OS
On Service
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OS
On Station
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OS
Old Skool
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OS
Operating System
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OS
Ordnance Survey
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OS
On Sea
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OS
Operating Strength
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OS
Other Specifications
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Similar to OS

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
1WVI - 1st West Virginia Infantry Regiment
1WVLA - 1st West Virginia Light Artillery Regiment

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