U.S. troops obey a set of legal guidelines called the Uniform Code of Military Justice. While the UCMJ mirrors civilian law in many ways, there are some laws on the military books that are unique and somewhat bizarre.

1. Dueling

Sorry, all you potential Aaron Burrs. Dueling isn’t allowed in the U.S. military. You cannot pull out your sword, pistol, or even your fists and challenge someone who has wronged you to a duel. According to the manual, “Any person subject to this chapter who fights or promotes, or is concerned in or connives at fighting a duel, or who, having knowledge of a challenge sent or about to be sent, fails to report the fact promptly to the proper authority, shall be punished as a court-martial may direct.”

Maximum punishment: Dishonorable discharge, forfeiture of all pay and allowances, and confinement for 1 year, if you ever get involved under infractions like this you should look for a court martial attorney.

2. Drinking liquor with prisoners

If you’re standing post and guarding a prisoner, you aren’t supposed to give him or her booze. We thought this one was pretty weird, but the existence of such a law makes us think that someone, somewhere, must have actually done this one. But, umm, why?

Maximum punishment: Confinement for 3 months and forfeiture of two-thirds pay per month for 3 months.

3. Indecent language

Profanity and dirty jokes are a crime, at least in the U.S. military. We’ve all heard the phrase “cuss like a sailor,” but that sailor can actually be busted for having a potty mouth. According to the manual, “‘Indecent’ language is that which is grossly offensive to modesty, decency, or propriety, or shocks the moral sense, because of its vulgar, filthy, or disgusting nature, or its tendency to incite lustful thought.”

This one probably isn’t enforced all that often, but it does carry some stiff punishments when it is.

Maximum punishment: Communicated to any child under the age of 16 years: Dishonorable discharge, forfeiture of all pay and allowances, and confinement for 2 years. Other cases: Bad-conduct discharge, forfeiture of all pay and allowances, and confinement for 6 months.