The country expects from their civilians to serve in the army up to 3 years.
Jo.R made a good point about how unfair and unjustified it is to expect that other people will fight your battles.
If you don't approve of some of the military actions, you still have to serve the minimum time and then, when you finish and release from your serves you can make a diffrent as a civilian by protest or even running to be the next prime minister.