More than career ending.

UCMJ Article 88 (Contempt toward officials)

• Prohibits using “contemptuous words” against the President, Vice President, Congress, the Secretary of Defense, military department secretaries, governors, and certain other officials.
• Maximum punishment can include dismissal from the service, forfeiture of all pay and allowances, and confinement for up to one year.

Add that Trump will probably try to call it Treason.

Yeah, not brave at all. People that talk shit online don’t have a clue what they are talking about.