A draft is by definition forced labor either way - because if enough people volunteered there would be no need for a draft in the first place.
But usually it doesn't matter either way. Either the people believe in their own government/territory and see it as worth defending, or alternatively they don't believe in it, but their government is authoritarian and will force you at risk of punishment or death into being drafted.
In both cases a draft is still forced labor for those who did not volunteer to participate.
That's a pretty binary view of the situation. It's not enough for something to be worth defending: People have to recognize that it's worth defending — and that might not happen instantaneously, because "people" come to appreciate things at very different rates.
Today’s average Western nation-state tends to be a rathole that spits into the faces of its citizens every single day, until the moment the state is under attack, at which point everyone is told that they owe their lives to their sacred motherland that has done so much for them.