In the final battle, human space fleet approaches the enemy planet, and most of the ships are sacrificed in a tactical maneuver. How many people were on these ships, and what was their role?
In the movie, the small fighters are actually indeed drones controlled by the pilots at Ender's side. However, as Colonel Graff reveals, "We lost a thousand men on the transporters you abandoned!", the Transports do indeed have personnel onboard if only in minimal amounts. Also, if you notice when Ender is giving commands, he refers to the collective as a "Battle Group", and he orders them to deploy their drones, implying that the carriers and dreadnoughts themselves are not unmanned.