There's lots of thing that are legal for us and illegal for the military... Plus UCMJ has the "catch alls":
933. ART. 133. CONDUCT UNBECOMING AN OFFICER AND A GENTLEMAN
Any commissioned officer, cadet, or midshipman who is convicted of conduct unbecoming an officer and a gentleman shall be punished as a court-martial may direct.
934. 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.
Which means they can fry your ass for just about anything they want!
