it might be objected that the cases of taxation and national service are not (i) _____ : while taxation must be (ii) _____ , the military is quite able to find recruits without resorting to conscription. Furthermore, proponents of national service do not limit its scope to only those duties absolutely necessary to the defense of the nation. Therefore, it may be contended, compulsory national service (iii) _____ the acceptable boundaries of governmental interference in the lives of its citizens.