Just figured I'd mention that FurturisticM1's idea should work - I can't, by any stretch of the imagination, see why it wouldn't. If you're in need of pilot voices that no faction uses, every pilot_c_(whatever) voice is un-used. The voices themselves have practically no variation from one-another, and personally I think they sound rather un-professional (I think they were designed to be civilian voices). There are also other voices aside from the pilot_c_(whatever)s that are un-used (10 in fact) that sound fine and were added to the normal voice-pool for every faction in 88 Flak (making for 17 total NPC voice-types instead of Freelancer's stock 10). But anyways, any of these un-used would be a nice target to experiment on, and if you created a wingmen faction that only used these voices you'd be golden.