It's the same here in Norway.
Men have to join the Military (10-12 months) when they are 18 (max 28), and you have to do do civil service (13 months) if you don't want to join.
But in the recent years, with a lot of budget cuts, the number of soldiers in the Norwegian Defence has been reduced a lot.
100% of the men are supposed to do military service, but in reality only 40-50% are used now.
We do also have a small number of professional soldiers.
Girls can also join the military, but they have to volunteer for that.