Certain characters have certain R&D abilities; either facility design, ship design, or troop design research. For instance, I believe Wedge Antilles can do ship design while Lando Calrissian can do facility design. Certain characters can do all three types of R&D (I believe Bevel Lemelisk for the Empire is one of them). In order to do R&D, you must select a character with R&D abilities, and have him perform a [ship/troop/facility] design mission on a planet with a [shipyard/troop training facility/construction yard]. Periodically, you will be informed that a new [ship/troop/facility] has been designed, and you can then build it.
I liked Rebellion as well, but got bored with it after awhile. I also never liked the whole setup of the game, such as sending Needa or Ozzel on a sabotage mission. How come an Imperial officer is better at sabotaging a refinery than a squad of Imperial commandos?! I'm a realism junkie I know, but that whole idea of sending officers out on spy missions and the like just really irritated me.
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Arena of Fire ||
Grand Temple of Fire ||
The man who believes he can and the man who believes he can't are both right. Which are you?