I doubt that we left stray nuclear weapons lying around after we left an overseas installation. We’ve never done that anywhere else.
Who said we left?
At least as late as when I was stationed in Aviano (mid 90s), there were troops at those locations (sky cops, munitions maintenance, and comm troops).
One other point: funny thing about the SOFA with Turkey. Any property that stayed in country more than 90 days became property of the Turkish General Staff.
As an example, the 401st TFW was actually war planned to operate out of Incirlik, but because of the Turkish SOFA, they were only ever TDY to Incirlik...and were stationed at Torrejon. They rotated in and out on 89 day TDYs to avoid that little provision of the SOFA (of course, when Torrejon closed, they moved the wing to Aviano and redesignated it the 31 FW...but that's another story altogether)