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This is the guidance for Body Piercing/Ornamentation in civilian attire off duty on a military installation.
What is with the exception of earrings for
women (see paragraphs 6.3.1.1) and areas in and around military family and privatized housing, all Air Force members are prohibited from attaching, affixing and/or displaying objects, articles, jewelry or ornamentation to and/or through the ear, nose, tongue, eye brows,
lips, or any exposed body part (includes visible through clothing).