We already have Marshall law, at least in some of our less populated areas. (Where I live, Deputy Sheriffs are the law ...)
“Martial law” is when the military is called out for domestic policing. Hard to believe our military would comply, though, in the absence of a total breakdown of law and order.
> Martial law is when the military is called out for domestic policing. Hard to believe our military would comply, though, in the absence of a total breakdown of law and order.
As well, in America you have the mis-named “Posse Comitatus” law that prevents your Army from being used against domestic threats.
(”Posse Comitatus” is actually a principle from the Magna Carta that allows the Lord of the Manor to raise a posse from the countryside to help catch felons when-and-as-needed).