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-Full Form of O4 is Officer grade: Commander or Lieutenant Colonel
You can get all the information about acronym or abbreviation of O4 related to all terminology where some of O4 Full forms can be referred here. At Freshhiring.com, you can get all updates on various acronym / abbreviation / shorthand for in general or specialized based upon your interest.
-Full Form of O4 is Officer grade: Lieutenant Commander or Major
-Full Form of O4 is Officer grade: Captain or Colonel