Defense of a country in the case of direct attack, or more complicatedly in the defense of an allied country in cases like NATO where all members consider an attack on any member as though it were an attack on them.
I will add the caveat though that not having a well funded, trained, and staffed military prior to hitting the conscription button is certainly a point in the column of incompetence if not unacceptable behavior.
Defense of a country in the case of direct attack, or more complicatedly in the defense of an allied country in cases like NATO where all members consider an attack on any member as though it were an attack on them.
I will add the caveat though that not having a well funded, trained, and staffed military prior to hitting the conscription button is certainly a point in the column of incompetence if not unacceptable behavior.