Not do invading? Long-running conscription could work with advanced tech. Not 1-year-to-train-and-then-back-to-civilian-life. But train-and-then-keep-training-

Not do invading? Long-running conscription could work with advanced tech. Not 1-year-to-train-and-then-back-to-civilian-life. But train-and-then-keep-training-till-40+.