Every other country makes Stinger equivalents of the shoulder launch or air-to-air type. That one looks like the same heat seeking variety but mounted on the tail wing of an aircraft. Details, details.
So what you're saying is the missiles might not have actually come from the U.S. or the CIA at all? I mean, if "every other country" is making stinger knock-offs, why pin them on anyone in particular?
But Bec's point was that the picture is of (I believe) the Sidewinder missile - an air-to-air missile with a range of some 30+ km. A Stinger is man-portable and has a range of less than 5 km and is less than 1/5th the size/weight.
Also the South would have still lost.
The Spanish Republicans lost too, despite being backed by an outside power (the Soviet Union) and foreign fighters - but we're supposed to ignore that, because the FSA are evil precisely because they are also (allegedly) backed by an outside power and foreign fighters. And there has been a paucity of evidence for either.