If soldiers are free to interpret the Constitution as they see fit, then we don’t have an Army. Also in that oath is a pledge to obey the orders of the officers appointed over them. They don’t get to decide if that officer was appointed legally or not - that’s someone else’s job.
You and a few others keep ignoring one thing about the pledge... the Oath "to Protect and Defend the Constitution" comes first and it was put there by the founders for a very specific reason; governments can become corrupt, and when they do, the Consitution gives very specific power to "The People" up to and including replacing the government.
When a government attempts to subjugate it citizens then it is up to EVERY single solitary American Citizen (including military members) to make the decision... is this constitutional.
Also in that oath is a pledge to obey the orders of the officers appointed over them.
and that would be false, "to knowingly violate the laws, rights, Blah, Blah following the orders of a superior officer, ignorance is no excuse... Blah, Blah and is punishable...blah... blah... blah"