We already have drones, and the next gen (or the next) fighter aircraft will be unmanned. Maneuvering in a zero G environment is much easier for machines than 1 G across terrain.
Many / most weapons systems will be fully automated in 200 years. "Soldiers" will be deploying remote weapons for the rest. People will be too expensive, too big (or too small), too slow, and have too few sensory systems to be winning fights in space.
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