Stop slandering US service members and the military. We did not train ISIS. We trained FSA. All trainees were ID-d and vetted for terrorist links.
Others may have armed ISIS. I’ve read of Turkey arming them. But we did not train them. Please stop the lies about this.
Unlike most insurgent armies everywhere in the world they are armed almost exclusively with American arms, everthing from AR pattern rifles to heavier munitions. Some of this may have been captured in Mosoul, but they were already using American arms. Maybe captured somewhere else, but I think there is a lot of reasonable suspicion that the Obama administration armed them as part of their support for the anti-Assad forces in Syria, which they have come to dominate.
So I don't think it's an unfair point to say we have armed them.
They certainly don't seem to fight like an Army trained by Americans, so I doubt we trained them.