What type of responsibility are voting and serving in the military? mandatory voluntary personal political

Voting and serving in the military are voluntary personal responsibilities or rights in the United States. The United States has a voluntary military and therefore it is not required that citizens join or work in the military unless they voluntarily choose to do so. In addition, it is not compulsory that citizens vote and instead it is something that they voluntarily decide to do. 

They mowt likely lived in caves or maybe rock houses,i know they are similar but its all i know