The defence of the territorial integrity of a country by her people is part of?

The defense of the territorial integrity of a country by her people is part of their duties and obligations. In other words, it is the responsibility of the citizens of a country to protect and defend their nation's borders and territory against any threats. This can involve various actions such as serving in the military, supporting law enforcement and security forces, and being vigilant against foreign interference or aggression. By fulfilling this duty, citizens help to ensure the stability and sovereignty of their country, which is crucial for maintaining a safe and secure environment for themselves and future generations.