Back in the days of the original EV pirates were probably the easiest thing to get. I have been able to disable Confed Frigates and Cruisers (lead them out of your range while you fire proton turrets), and I have also gotten Rebel Destroyers. Has anyone ever gotten a Rebel Cruiser?
What I find interesting is that the Rebels (though new compared to the Confederation Navy) has somewhat better armed ships. The C-Cruiser had 4 or 5 Patrol ships, missiles, I think turrets, and the neutron blaster while the R-Cruiser had 4 or 5 Mantas, torpedoes, missiles, and lots of turrets.
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~Matt