Wear distinctive parts of a uniform only while the full uniform is being worn. For example, the green beret would be considered a distinctive part of a uniform and should not be worn unless the full uniform is being worn.
Wear only 1 of your uniforms when you are honorably discharged. All other uniforms and uniform parts remain the property of the armed forces. You may wear 1 uniform for the purpose of getting home. You must discontinue wearing the uniform after 3 months have passed from the date of your discharge.
BTW the punishment can be a fine or 6 month. The Marine Campaign Cover can only be worn by Drill instructors on active duty and then only with complete uniform.
Are you talking about the Sgt Major or the former Marine protester?