Thank you for the opportunity to help you with your question!
-Role of defensive which includes maintaining national military and local police which do protects against any loss of property and loss of liberty at hands of their domestic criminals or any foreign harm characters
For the Us constitution people have right to alter it any time as compared to others whereby the constitution can only be changed by explicit and authentic act of the whole people which is sacred obligatory upon all
Please let me know if you need any clarification. I'm always happy to answer your questions.