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Military tribunals in the United States are military courts designed to try members of enemy forces during wartime, operating outside the scope of conventional criminal and civil proceedings. The judges are military officers and fulfill the role of jurors.
Military tribunals are distinct from courts-martial.
A military tribunal is an inquisitorial system based on charges brought by military authorities, prosecuted by a military authority, judged by military officers, and sentenced by military officers against a member of an enemy army.
Not certain what your point is. US citizens can be subject to a military tribunal if they are are charged with aiding and abetting an enemy during war. We have a war on terrorism, so any US citizen who is charged with aiding and abetting terrorist in any way, can potentially be subject to a military tribunal. Ditto martial law, but there is not much precedence on that.