"It is DOD policy to encourage members of the armed forces to carry out the obligations of citizenship while keeping with the traditional concept that members on active duty should not engage in partisan political activity," the regulation reads.

"All members of the armed forces, including active-duty members, members of the reserve components not on active duty, and retired members are prohibited from wearing military uniforms at political campaign or election events."

https://www.newsweek.com/photo-uniformed-marines-mar-lago-event-raises-eyebrows-1890098

now please explain the presence of military personal at trumps inauguration.