• 3 defintions found in Acronymia,
• 9 defintions found in AcroLexic: Acronyms and Abbreviations Dictionary:

OMC

Operating and Maintainance center

Office of Munitions Control

Office of Motor Carriers

AcroLexic: Dictionary of Acronyms and Abbreviations contains 6 more definitions of “OMC”.

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See also