This explains precisely when military tribunals can be used for civilians. Graham questioning Kavanaugh at his hearing.
https://www.youtube.com/watch?v=oOAkU_4iPYA
Graham asks Kavanaugh about Military Tribunals
Thanks for the link. It would need to be seen if the Supreme Court would accept treating street criminals as enemies of the government, and allow them to be tried by military tribunals. Someone who conspires with the enemy against their own government...yes, that could be covered until military law, but your everyday street criminal, who is covered by the penal law in this country, I would think is a different story. That’s why the article I read, specifically noted that during Martial Law, civilian criminals can be prosecuted according to military law.