The US doesn't do conscription. We have something of an economic draft in this country. There's a whole different conversation to be had about that. I suspect a non-zero change to the frequency and motivations behind our deployments to follow if we make earning privilege compulsory. Our veterans services would likely look a fair bit different as well.
I didn't say anything about reverting back to medieval weaponry or battle tactics. More than a couple ways to make their ears ring these days even if they aren't the tip of the spear.