Whether or not we're in a time of public danger is definitely up for debate, but you can't just leave off the second condition in an or statement and pretend it doesn't exist when trying to claim the statement is false.

Findlaw (usually reasonably accurate) claims that is the case

> The protection of indictment by grand jury extends to all persons except those serving in the armed forces. All persons in the regular armed forces are subject to court martial rather than grand jury indictment or trial by jury.33 The exception’s limiting words when in actual service in time of war or public danger apply only to members of the militia, not to members of the regular armed forces.

https://constitution.findlaw.com/amendment5/annotation01.htm...

During wartime disobeying a direct order is a serious offense (probably one of the most ‘infamous’ of offenses) but during peacetime you get to have a trial and more than likely not be shot.