I thinks its called a Tour or Tour of Duty
No this is wrong as they have a military service.
SCUTAGE
Deferment.
Tax paid as military service to feudal lords and Kings in medieval period was called SOCAGE.
Selective Service.
a person who is drafted into military service
DD214
Veterans.
The military give them the names.
Feudalism is the political system in which land is given for military service in medieval times.
the free peasant suffered during that period because of the military service and the months forced labor
In most countries, enlisting in the military is not mandatory. However, there are countries with mandatory military service laws that require all eligible citizens to serve in the military for a specified period. It's important to check the requirements and laws of your specific country to understand if military service is mandatory or voluntary.