U.S. military regulations impose strict limitations on service members’ political activities, especially in uniform, and Article 88 forbids officers from using contemptuous words against the President or Vice President.
As a civilian I don’t think calling for legal impeachment is contemptuous, nor is peaceful First Amendment Activity. The GOP-majority congress has let us all down, choosing party and Trump over country.
Murdoch’s presses are why Trump got elected the first time. Trump has threatened broadcasting licenses, which strikes at one ventricle of the First Amendment. If Newsom is on the ballot for president, I’ll happily vote for him.