Most, if not all, military historians I have read agree that the man portable Stinger missile systems that the CIA provided the Mujihadeen was the most important factor in turning the war and forcing the Soviets to turn tail.
I am not suggesting anything in regards to Syria at this point, just responding to your comment in regards to the USSR/Afghanistan conflict and our involvement.
I have read information backing this too but also read books that have compelling arguments on the contrary. I tend to side with the contrary opinions.
