America itself is using Super Tunaco.and its for support role.there is no denying the fact that there is too many Russian or Chinese jets in the market,but one thing to be noticed that ISAF didn't give any 2nd hand equipments or which they gave,its there own equipment.and they're getting top equipment in the market(they didn't get basic Mi-17,but they got Mi-17V5,top in its class..same goes for Super Tunaco)may be some Russian fighter,yes.but then it'll be new jets..or else,it'll be any American jet.there is not much of a difference in Russian top of the line jets with American F-15/F-16.also,USA will get another client.