The Constitution does not have such rules. Does that mean you cannot ever get out? Wouldn't that seem like tyranny? Look at the 10th Amendment. The states have rights which are not enumerated. Is the right of secession discussed? No. It is an unenumerated right. Which means, according to the 10th Amendment, that this is a right which is reserved to the states.
Getting into the union is a joint decision by both parties. But getting out ought to be something a state can choose to do by itself.
You cannot just up and decide you no longer want to be in the military and then just leave. You leave when the military decides you can leave. Even at the end of your enlistment the military can force you to remain. Or once you are out the military can force you back in. It's commonly referred to as stop-loss.
Maybe you would like to try another analogy?
Careful, some Freepers only like the 10th ammendment when it suits them. The fact is that you were presented with a false dilemma, a logical fallacy, stemming from a false analogy. The military is not the same as a Voluntary Confederation of states.
Not only did the Founding Fathers write about what powers, not rights, the Federal Government had, they also gave the very foundation of when a Government was ripe to be thrown out. The same people who will argue that states should challenge the Federal Government now, are aghast at the idea that there was a time when their forefathers did so too.
Slavery was bad, and abolished through a Constitutional amendment. Not the Civil war. The war was not, and will never have been, no matter how many people proclaim it to have been, about slaves. It’s was about Fedzilla, before we knew it to be Fedzilla. It was just the start of baby Fedzilla. It started with the illegal occupation of one sovereign nation by another, over economic (power) issues.