You are not 100% correct, I posted this a few days ago:
From this link: https://www.lawfareblog.com/military-jurisdiction-over-civilians-why-supreme-court-should-grant-cert-ali
Prior to 2006, the UCMJ had authorized military trials for civilians serving with or accompanying an armed force in the field, but only during time of war.
In 2006, Congress expanded that authorization to also allow such trials during a contingency operation, which federal law defines as virtually any overseas deployment (and some domestic ones) where troops are or may become involved in operations against an enemy of the United States or against an opposing military force.
That article also gives examples of civilian contractors tried since the change in 2006 and notes that there is a limitation for this on host country nationals that is in place through the MEJA
Finally only military courts have express authority over military crimes. What I have found is that this includes mutiny and sedition; but not treason or espionage.
The only questions for me then would be:
a) Do the crimes in question fall under the sedition exclusivity for military courts? Sedition for me means: overt conduct, such as speech and organization, that tends toward insurrection against the established order. Sedition often includes subversion of a constitution and incitement of discontent towards, or resistance against established authority. The subversion of the constitution piece would be the main focus of concern here. Typically the military uses this charge for disruption of good order and discipline, but it is a rare charge. Usually failure to follow/obey lawful orders gets the most usage.
b) Could the individuals as part of taking their oaths or holding certain positions have agreed to fall under the UCMJ for certain aspects of their duties or certain charges? I could see where the Secretaries of defense, army, navy, etc and the President would be in the chain of command and subject to the UCMJ - I just dont know if that is formalized. What about the rest of the cabinet? Not sure.
c) Did any of the acts occur In Theater or within an operational zone?
I would instead see illegal contact with a foreign national as violations of espionage, treason, and/or the Logan Act. All can be tried in civilian courts and cover the acts you noted. Again for me the question is did they rise to subversion of the Constitution and the definition of Sedition. In that case it could be taken into military courts as I understand.
For any of those better versed in the legal parsing - please chime in.
You are not 100% correct,
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UCMJ which applies to military personnel and a very narrow slice of civilians working ina war zone . From my post earlier.
Sedition, treason, etc by a civilian must be tried in civil court. The secretarys you described are not members of the military and are not covred byt the ucmj. The civilians covered by ucmj are exactly the ones you described, namely, contractors (mercenaries) acting with US forces.
Your questions are thoughtful and there has been much litigation on them over the years as a rsult of the Blackwater cases and the War on Terror.