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What does OS1 Stand For in Government & Military ?
For OS1 we have found 5 definitions.
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What does OS1 mean? We know 5 definitions for OS1 abbreviation or acronym in 2 categories. Possible OS1 meaning as an acronym, abbreviation, shorthand or slang term vary from category to category. Please look for them carefully.
OS1 Stands For:
Rank | Abbreviation | Meaning | |
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***** | OS1 | Operations Specialist Petty Officer First Class |