The idea of any kind of combat in space is a bad idea, whether it be dropships or hunter-killer sats. The main reason for a large space station would be for research purposes. There are some things that can only be done in space, and would be important to colonists in OP3. They would probably try to fix/refuel their ship as soon as possible so that they could colonize a new planet and not be humanity's last hope for a third time.
