What it is: Compulsory military service
What it means: Some countries introduce conscription in time of war, because there are not enough professional soldiers or volunteers. There are also countries which still have forms of 'national service': compulsory call-up of young adults (usually male) for a period of a year or more. In some countries conscripts have to do a 'tour of service' at regular intervals, to keep them in training and available in case of war. Conscientious objectors are people who refuse to be conscripted, and may be imprisoned as a result.
Think about it: Is conscription an abuse of human rights?