[butterdezillion]

What are the rules he broke?

He had a disclaimer saying that his site was not associated with the USMC.

What rule did he break? Show it to me.

[A.A. Cunningham]

Article 134 for being an obtuse s***bird for starters.

9 years and he was still a Sergeant. That in and of itself was reason enough to RIF that pogue.

[xone]

ART. 134. GENERAL ARTICLE Though not specifically mentioned in this chapter, all disorders and neglects to the prejudice of good order and discipline in the armed forces, all conduct of a nature to bring discredit upon the armed forces, and crimes and offenses not capital, of which persons subject to this chapter may be guilty, shall be taken cognizance of by a general, special or summary court-martial, according to the nature and degree of the offense, and shall be punished at the discretion of that court.

I'm sure he was counseled, yet continued.

[Old Teufel Hunden]

"What rule did he break? Show it to me."

As a member of the armed forces (whether in uniform or out of uniform) you cannot make public statements criticizing the commander in chief. A number of generals of gotten retired over this issue through the years. What makes this case a little unique is that it was a sergeant. However, the rule still applies. It disrupts the good order and discipline of the armed forces to have the troops openly criticizing their commander in chief in a public forum. He should have just kept it at grumbling with his buddies.

[US Navy Vet]

OK his Oath of Enlistment for starters:
I, (NAME), do solemnly swear (or affirm) that I will support and defend the Constitution of the United States against all enemies, foreign and domestic; that I will bear true faith and allegiance to the same; and that I will obey the orders of the President of the United States and the orders of the officers appointed over me, according to regulations and the Uniform Code of Military Justice. So help me God.