Freedom of speech
Freedom to choose where you live
Freedom to disobey an order from a superior.
I have not served in the military. However I have family that has and still do. They have joked the the words "Property of the US Government" on their dog tags do not refer to the tags but to the person. It is a joke but also somewhat true. As a member of the military you will do what you are told or face the consequences which could include prison time. What would happen if a service member was told they were deploying and that person said, "no, I'm not going" and went AWOL?
On the other hand I as a civilian I can tell my boss to go pound sand and the worse thing they can do to me is fire me.