Some, like Germany, have been doing it for decades.
There's zero chance that happens.
1. We are not designed, equipped, or trained to successfully fight wars w/ large #'s of conscripted troops
2. The amount of $$ to train, equip, & feed that many additional mouths would be a tremendous waste
3. It's a politically-losing move that would never pass Congress, which would be a required move to implement it
Nobody on the planet fights wars the way we do, partly because nobody spends as much money as we do. That high cost comes w/ benefits that others cannot replicate. It's why comparing Russia/Ukraine to any theoretical conflict involving us is flawed.
