I can’t speak for Naval regulations, but Army - definitely not. Retirees and honorably discharged Army may wear their dress uniform to funerals, at patriotic parades or parades on national holidays, and while travelling to their home of record within three months of discharge. Any other purpose is prohibited (with few exceptions such as teaching at a military facility).
It is a shame to see someone degrade the uniform. It is a poor choice and in bad taste.
Unless it’s for a funeral or parade....the only other place is a Halloween costume party. Maybe the political rally counts as a costume party, in the eyes of some folks.
The UCMJ covers all the services - and the answer is NO for all of them. The only difference is the Navy Protesters should be tossed into the brig, while I believe the Army's home for them is called a stockade.
Scary comments though concerning our military. Glenn Beck on GBTV yesterday showed some facts about Gang members now entering all branches of the service, and he showed a large list of the gangs members that are known to me in our military. What happened to our Military during the Carter years (letting just about anyone in) is happening again, but much much worse. On Leftist Talk radio last night (Mike Malloy show) they played audio from a marine calling on all his fellow Marines to join the Revolution.
Scary times indeed.