Conscription is even worse than Slavery.
Slavery is the idea that your work choices belong not to you but to someone else, and that someone else has a responsibility to keep you safe from life threatening situations.
Conscription is the idea that your work choices belong not to you but to someone else, and that someone else has no responsibility to keep you safe from life threatening situations.
And a libertarian would say: "Taxation is the idea that the fruits of your work belong not to you but to someone else". Would you agree with that as well?
Except taxation is necessary and conscription is not.
If it's not necessary then why did almost all countries that participated in World War II practice it?