All Norwegians have to register for the draft and then go for a medical and psychological check-up. Their motivation is screened too.
Then Norway selects those with the highest motivation and those best suited for the military and drafts them, regardless of whether they are men or women.
How is that not the very best system?
From Wikipedia: Norway employs a weak form of mandatory military service for men and women. While 63,841 men and women were called in for the examination of persons liable for military service in 2012 (mandatory for men), 9265 were conscripted. In 2015 conscription was extended to women making Norway the first NATO member and first European country to make national service compulsory for both men and women. There is a right of conscientious objection.