either the military disobeys the president (which is unconstitutional) or the president violates separation of powers (which is unconstitutional)
I don’t see how disobeying your boss is unconstitutional. It may be detrimental to your job but it’s not unconstitutional
As other posters have said, there’s lots of wiggle room in who can start military action, starting with the War Powers Act, so no violation of separation of powers either