Final answer:
Mandatory military service is a system in which individuals are required to serve in the military. Opinions on this practice vary among individuals and can be influenced by several factors.
Step-by-step explanation:
Mandatory military service refers to a system in which individuals are required to serve in the military for a certain period of time. This practice is followed in several countries such as Egypt, Switzerland, Turkey, and Singapore. In contrast, the United States does not have mandatory military service, but males are legally required to register for selective service when they turn 18. Opinions on mandatory military service vary among individuals and can be influenced by factors such as national security concerns, personal values, and beliefs.